Add MINGW_LIBRARIES to the linker flags

This is essential when building with -nodefaultlibs.

This is similar to what already is done in libcxxabi in SVN r302760.

Differential revision: https://reviews.llvm.org/D37207

llvm-svn: 312498

libcxx/lib/CMakeLists.txt

@@ -91,6 +91,7 @@ else()
   add_library_flags_if(LIBCXX_HAS_GCC_S_LIB gcc_s)
 endif()
 add_library_flags_if(LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB atomic)
+add_library_flags_if(MINGW "${MINGW_LIBRARIES}")
 
 # Add the unwinder library.
 if (LIBCXXABI_USE_LLVM_UNWINDER)