Update serialport to be compatible to newer ruby versions #79
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This merges the fix and polyfill discussed in: https://bugs.ruby-lang.org/issues/20265#note-7 Fixes hparra#78
It isn't running any longer for decades.
Fixes: LoadError: cannot load such file -- C:/ruby-serialport/(eval at C:/ruby-serialport/lib/serialport/version (LoadError)
Warning was: warning: 'fd' is deprecated: rb_io_descriptor
warning: initialization discards "const" qualifier from pointer target type [-Wdiscarded-qualifiers]
"/dev/ttyS0"
warning: comparison of integer expressions of different signedness: "int" and "long unsigned int" [-Wsign-compare]
if (num_port < 0 || num_port > sizeof(ports) / sizeof(ports[0]))
warning: function might be candidate for attribute "noreturn" [-Wsuggest-attribute=noreturn]
warning: "PURGE_RXABORT" redefined
581 | #define PURGE_RXABORT 0x02
| ^~~~~~~~~~~~~
In file included from C:/msys64/ucrt64/include/windows.h:70,
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I would be willing to maintain this gem, because I have some projects which use it. It's the only serial gem, which can query and set the control pins on Linux and Windows.