fix: include headers necessary to build with llvm

[heather7283]

Problem description

ImHex fails to build on llvm-based system:

Error 1

In file included from /home/heather/downloads/ImHex/lib/libimhex/source/helpers/http_requests.cpp:1:
In file included from /home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests.hpp:158:
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:29: error: expected ';' after expression
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |                             ^
      |                             ;
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:18: error: no member named 'scoped_lock' in namespace 'std'; did you mean 'adopt_lock'?
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |             ~~~~~^~~~~~~~~~~
      |                  adopt_lock
/usr/include/c++/v1/__mutex/tag_types.h:35:31: note: 'adopt_lock' declared here
   35 | inline constexpr adopt_lock_t adopt_lock   = adopt_lock_t();
      |                               ^
In file included from /home/heather/downloads/ImHex/lib/libimhex/source/helpers/http_requests.cpp:1:
In file included from /home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests.hpp:158:
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:30: error: use of undeclared identifier 'lock'
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |                              ^
[ 67%] Building CXX object lib/libimhex/CMakeFiles/libimhex.dir/source/helpers/logger.cpp.o
3 errors generated.
gmake[2]: *** [lib/libimhex/CMakeFiles/libimhex.dir/build.make:373: lib/libimhex/CMakeFiles/libimhex.dir/source/helpers/http_requests.cpp.o] Error 1
gmake[2]: *** Waiting for unfinished jobs....
In file included from /home/heather/downloads/ImHex/lib/libimhex/source/helpers/http_requests_native.cpp:3:
In file included from /home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests.hpp:158:
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:29: error: expected ';' after expression
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |                             ^
      |                             ;
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:18: error: no member named 'scoped_lock' in namespace 'std'; did you mean 'adopt_lock'?
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |             ~~~~~^~~~~~~~~~~
      |                  adopt_lock
/usr/include/c++/v1/__mutex/tag_types.h:35:31: note: 'adopt_lock' declared here
   35 | inline constexpr adopt_lock_t adopt_lock   = adopt_lock_t();
      |                               ^
In file included from /home/heather/downloads/ImHex/lib/libimhex/source/helpers/http_requests_native.cpp:3:
In file included from /home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests.hpp:158:
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:30: error: use of undeclared identifier 'lock'
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |                              ^
/home/heather/downloads/ImHex/lib/libimhex/include/hex/helpers/http_requests_native.hpp:82:13: error: expression result unused [-Werror,-Wunused-value]
   82 |             std::scoped_lock lock(m_transmissionMutex);
      |             ^~~~~~~~~~~~~~~~
/home/heather/downloads/ImHex/lib/libimhex/source/helpers/http_requests_native.cpp:92:26: note: in instantiation of function template specialization 'hex::HttpRequest::executeImpl<std::vector<unsigned char>>' requested here
   92 |             return this->executeImpl<std::vector<u8>>(response);
      |                          ^
4 errors generated.
gmake[2]: *** [lib/libimhex/CMakeFiles/libimhex.dir/build.make:387: lib/libimhex/CMakeFiles/libimhex.dir/source/helpers/http_requests_native.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:3284: lib/libimhex/CMakeFiles/libimhex.dir/all] Error 2
gmake: *** [Makefile:136: all] Error 2

Error 2

/home/heather/downloads/ImHex/main/gui/source/messaging/linux.cpp:32:25: error: no member named 'write' in the global namespace
   32 |         std::ignore = ::write(fifo, data, dataSize);
      |                       ~~^
/home/heather/downloads/ImHex/main/gui/source/messaging/linux.cpp:33:9: error: use of undeclared identifier 'close'
   33 |         close(fifo);
      |         ^
/home/heather/downloads/ImHex/main/gui/source/messaging/linux.cpp:37:9: error: use of undeclared identifier 'unlink'
   37 |         unlink(CommunicationPipePath);
      |         ^
/home/heather/downloads/ImHex/main/gui/source/messaging/linux.cpp:47:32: error: no member named 'read' in the global namespace
   47 |                 int result = ::read(fifo, buffer.data(), buffer.size());
      |                              ~~^
/home/heather/downloads/ImHex/main/gui/source/messaging/linux.cpp:63:13: error: use of undeclared identifier 'close'
   63 |             close(fifo);
      |             ^

Implementation description

Included necessary headers

Screenshots

None

Additional things

None