Fix: Missing `ssize_t` on Windows #969

Job	Run time
MacOS	2m 35s
Ubuntu (Clang 18)	5m 1s
Docker	31s
Ubuntu (GCC 14)	7m 29s
Windows	3m 34s
Cross Compilation (amd64, x86_64-linux-gnu)	1m 18s
Cross Compilation (arm64, aarch64-linux-gnu)	1m 6s
Update Version	5s
Android NDK Build (armv7a, armeabi-v7a, armv7-linux-androideabi)	58s
Android NDK Build (aarch64, arm64-v8a, aarch64-linux-android)	43s
Build Python Wheels	0s
	23m 20s

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