Move LTCG/LTO enablement into the build scripts

scripts/build-arch.bat

@@ -154,6 +154,11 @@ mkdir %BUILD_FOLDER%
 mkdir %INSTALLER_FOLDER%
 mkdir %SYMBOLS_FOLDER%
 
+rem Enable LTCG for official builds
+set CFLAGS=/GL
+set CXXFLAGS=/GL
+set LDFLAGS=/LTCG
+
 echo Configuring the project
 pushd %BUILD_FOLDER%
 %QMAKE_CMD% %SOURCE_ROOT%\moonlight-qt.pro

scripts/generate-dmg.sh

@@ -41,6 +41,11 @@ mkdir $BUILD_ROOT
 mkdir $BUILD_FOLDER
 mkdir $INSTALLER_FOLDER
 
+# Enable LTO for official builds
+export CFLAGS=-flto=thin
+export CXXFLAGS=-flto=thin
+export LDFLAGS=-flto=thin
+
 echo Configuring the project
 pushd $BUILD_FOLDER
 qmake $SOURCE_ROOT/moonlight-qt.pro QMAKE_APPLE_DEVICE_ARCHS="x86_64 arm64" || fail "Qmake failed!"