[OpenMP] Only use #pragma comment(lib, ...) in MSVC build configurations

[mstorsjo]

Summary

MinGW build configurations don't support this pragma (unless compiling with clang, with -fms-extensions, and linking with lld), and at least clang warns about it.

This library does end up linked by the cmake files anyway (as long as the check works properly).

(I guess this could be made to be handled by cmake as well, by generalizing the existing code for mingw?)

[AndreyChurbanov]

LGTM

openmp/runtime/src/z_Windows_NT_util.cpp

 
 /* This code is related to NtQuerySystemInformation() function. This function
    is used in the Load balance algorithm for OMP_DYNAMIC=true to find the
    number of running threads in the system. */
 
 #include <ntsecapi.h> // UNICODE_STRING
 #include <ntstatus.h>
 #include <psapi.h>
+#ifdef _MSC_VER
 #pragma comment(lib, "psapi.lib")
+#endif
 
 enum SYSTEM_INFORMATION_CLASS {
   SystemProcessInformation = 5
 }; // SYSTEM_INFORMATION_CLASS
 
 struct CLIENT_ID {
   HANDLE UniqueProcess;
   HANDLE UniqueThread;