Link system libs MinGW-only

vst/cmake/Vst3.cmake

@@ -175,6 +175,8 @@ function(plugin_add_vstgui NAME)
     target_include_directories("${NAME}" PRIVATE "${VST3SDK_BASEDIR}/vstgui4")
 
     if(WIN32)
+        if (NOT MSVC)
+            # autolinked on MSVC with pragmas
             find_library(OPENGL32_LIBRARY "opengl32")
             find_library(D2D1_LIBRARY "d2d1")
             find_library(DWRITE_LIBRARY "dwrite")
@@ -188,6 +190,7 @@ function(plugin_add_vstgui NAME)
                 "${DWMAPI_LIBRARY}"
                 "${WINDOWSCODECS_LIBRARY}"
                 "${SHLWAPI_LIBRARY}")
+        endif()
     elseif(APPLE)
         find_library(APPLE_COREFOUNDATION_LIBRARY "CoreFoundation")
         find_library(APPLE_COCOA_LIBRARY "Cocoa")