kc3-lang/sys_wait

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+header-only Windows implementation of the `<sys/wait.h>` header.
+
+tested on the following compilers:
+- Visual Studio
+- Clang for Windows (clang-cl)
+- GCC (MinGW)
+
+implements the following functions:
+- wait
+- waitpid
+- waitid
+- wait3
+- wait4
+
+currently, doesn't implement process group based wait.