contrib: qt: disable printsupport

It is built, but not installed. This causes problems on macOS when
linking our libqt_plugin:

clang: error: no such file or directory: '/vlc/contrib/x86_64-apple-darwin19/lib/libQt5PrintSupport.a'

Since we don't use any of the printer related functionality, disable it
altogether.

contrib/src/qt/rules.mak

@@ -105,7 +105,7 @@ endif
 QT_CONFIG := -static -opensource -confirm-license $(QT_OPENGL) -no-pkg-config \
 	-no-sql-sqlite -no-gif -no-openssl -no-dbus -no-vulkan -no-sql-odbc -no-pch \
 	-no-feature-testlib -no-feature-itemmodeltester -no-feature-sqlmodel -no-feature-sql \
-	-no-feature-xml -no-compile-examples -nomake examples -nomake tests \
+	-no-feature-xml -no-feature-printer -no-compile-examples -nomake examples -nomake tests \
 	-system-freetype -system-harfbuzz -system-libjpeg -system-libpng -system-zlib
 
 # For now, we only build Qt in release mode. In debug mode, startup is prevented by the internal ANGLE