Disable windeployqt release/debug flags for Mingw builds

These flags are not working for MinGW builds,

    https://bugreports.qt.io/browse/QTBUG-62103

for now disable them for the MinGW Makefiles generator.

cmake/WinDeployQt.cmake

@@ -15,12 +15,17 @@ function(WinDeployQt)
 	if(NOT _deploy_TARGET)
 		message(FATAL_ERROR "A TARGET must be specified")
 	endif()
-	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
-		list(APPEND _ARGS --debug)
-	elseif(CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
-		list(APPEND _ARGS --release-with-debug-info)
-	elseif(CMAKE_BUILD_TYPE STREQUAL "Release")
-		list(APPEND _ARGS --release)
+	if(CMAKE_GENERATOR STREQUAL "MinGW Makefiles")
+		# These flags no longer work in MinGW builds, disable for now
+		message(VERBOSE "Disabling windeployqt release/debug options - QTBUG-62103")
+	else()
+		if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+			list(APPEND _ARGS --debug)
+		elseif(CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
+			list(APPEND _ARGS --release-with-debug-info)
+		elseif(CMAKE_BUILD_TYPE STREQUAL "Release")
+			list(APPEND _ARGS --release)
+		endif()
 	endif()
 	if(_deploy_COMPILER_RUNTIME)
 		list(APPEND _ARGS --compiler-runtime)