Only build OS memory provider on linux

There is no implmenetation for windows anyway.

Author: igchor

src/CMakeLists.txt

@@ -36,7 +36,6 @@ if(UMF_BUILD_OS_MEMORY_PROVIDER)
         provider/provider_os_memory_linux.c
         memory_targets/memory_target_numa.c
         memspaces/memspace_numa.c)
-    set(UMF_SOURCES_WINDOWS ${UMF_SOURCES_WINDOWS} provider/provider_os_memory_windows.c)
     if(LINUX)
         set(UMF_LIBS ${UMF_LIBS} numa)
     endif()