Fix build errors on MSYS2 (Windows) (LabSound#198)

* Fix MSVC compiler flags being passed to the MSYS toolchain

Since MSYS uses GCC (or optionally clang), MSVC flags won't work here.

* Explicitly link Windows Media Foundation libraries for MINGW

It seems that building with VS "just works", but MSYS can't infer them.

cmake/LabSound.cmake

@@ -161,10 +161,12 @@ function (configureProj proj)
     )
     set_property(TARGET ${proj} PROPERTY CXX_STANDARD 17)
     if(WIN32)
-        # Arch AVX is problematic for many users, so disable it until
-        # some reasonable strategy (a separate AVX target?) is determined
-        #target_compile_options(${proj} PRIVATE /arch:AVX /Zi)
-        target_compile_options(${proj} PRIVATE /Zi)
+        if(MSVC)
+            # Arch AVX is problematic for many users, so disable it until
+            # some reasonable strategy (a separate AVX target?) is determined
+            #target_compile_options(${proj} PRIVATE /arch:AVX /Zi)
+            target_compile_options(${proj} PRIVATE /Zi)
+        endif(MSVC)
         # TODO: These vars are for libnyquist and should be set in the find libynquist script.
         target_compile_definitions(${proj} PRIVATE HAVE_STDINT_H=1 HAVE_SINF=1)
     elseif(APPLE)

cmake/examples.cmake

@@ -11,10 +11,12 @@ set(CMAKE_CXX_STANDARD 14)
 set(proj LabSoundExample)
 
 if(WIN32)
-    # Arch AVX is problematic for many users, so disable it until
-    # some reasonable strategy (a separate AVX target?) is determined
-    #target_compile_options(${proj} PRIVATE /arch:AVX /Zi)
-    target_compile_options(${proj} PRIVATE /Zi)
+    if(MSVC)
+        # Arch AVX is problematic for many users, so disable it until
+        # some reasonable strategy (a separate AVX target?) is determined
+        #target_compile_options(${proj} PRIVATE /arch:AVX /Zi)
+        target_compile_options(${proj} PRIVATE /Zi)
+    endif(MSVC)
     target_compile_definitions(${proj} PRIVATE __WINDOWS_WASAPI__=1)
     # TODO: These vars are for libniquist and should be set in the find libynquist script.
     target_compile_definitions(${proj} PRIVATE HAVE_STDINT_H=1 HAVE_SINF=1)
@@ -80,6 +82,10 @@ if (NOT IOS)
 target_link_libraries(LabSoundExample LabSound LabSoundRtAudio)
 endif()
 
+if(MINGW)
+    target_link_libraries(LabSoundExample mfuuid mfplat ksuser wmcodecdspuuid)
+endif(MINGW)
+
 set_target_properties(LabSoundExample PROPERTIES
                       RUNTIME_OUTPUT_DIRECTORY bin)