Utilities/Release: Update to Qt 5.12 on Windows builds

Utilities/Release/win32_release.cmake

@@ -8,12 +8,16 @@ set(CPACK_BINARY_GENERATORS "WIX ZIP")
 set(CPACK_SOURCE_GENERATORS "ZIP")
 set(MAKE_PROGRAM "ninja")
 set(MAKE "${MAKE_PROGRAM} -j16")
-set(qt_prefix "c:/Qt/5.6.3/msvc2017-32-xp-mt")
+set(qt_prefix "c:/Qt/5.12.1/msvc2017-32-w7-mt")
 set(qt_win_libs
   ${qt_prefix}/plugins/platforms/qwindows.lib
-  ${qt_prefix}/lib/Qt5PlatformSupport.lib
+  ${qt_prefix}/lib/Qt5EventDispatcherSupport.lib
+  ${qt_prefix}/lib/Qt5FontDatabaseSupport.lib
+  ${qt_prefix}/lib/Qt5ThemeSupport.lib
   ${qt_prefix}/lib/qtfreetype.lib
+  ${qt_prefix}/lib/qtlibpng.lib
   imm32.lib
+  wtsapi32.lib
   )
 set(INITIAL_CACHE "CMAKE_BUILD_TYPE:STRING=Release
 CMAKE_DOC_DIR:STRING=doc/cmake

Utilities/Release/win64_release.cmake

@@ -8,12 +8,16 @@ set(CPACK_BINARY_GENERATORS "WIX ZIP")
 set(CPACK_SOURCE_GENERATORS "")
 set(MAKE_PROGRAM "ninja")
 set(MAKE "${MAKE_PROGRAM} -j16")
-set(qt_prefix "c:/Qt/5.6.3/msvc2017-64-xp-mt")
+set(qt_prefix "c:/Qt/5.12.1/msvc2017-64-w7-mt")
 set(qt_win_libs
   ${qt_prefix}/plugins/platforms/qwindows.lib
-  ${qt_prefix}/lib/Qt5PlatformSupport.lib
+  ${qt_prefix}/lib/Qt5EventDispatcherSupport.lib
+  ${qt_prefix}/lib/Qt5FontDatabaseSupport.lib
+  ${qt_prefix}/lib/Qt5ThemeSupport.lib
   ${qt_prefix}/lib/qtfreetype.lib
+  ${qt_prefix}/lib/qtlibpng.lib
   imm32.lib
+  wtsapi32.lib
   )
 set(INITIAL_CACHE "CMAKE_BUILD_TYPE:STRING=Release
 CMAKE_DOC_DIR:STRING=doc/cmake