qtbase-native: disable vulkan support

Vulkan may get enabled if the host has vulkan headers available,
which will cause a build break.

Signed-off-by: Samuli Piippo <samuli.piippo@qt.io>

recipes-qt/qt5/qtbase-native_git.bb

@@ -73,6 +73,7 @@ QT_CONFIG_FLAGS = " \
     -no-sql-sqlite \
     -no-sql-psql \
     -no-opengl \
+    -no-vulkan \
     -no-openssl \
     -no-xcb \
     -no-icu \