meson.build: link the sources directly into libxkbcommon-x11 Similar to 75ce741ab97e3d17a0c9b06dd4bdf57c00d5538e, just for the -x11 sublibrary. This works around meson bug 3937, 'link_whole' arguments don't get added into the final static library and we end up with a virtually empty 8-byte libxkbcommon-x11.a file, see https://github.com/mesonbuild/meson/issues/3937 The internal lib is still built for the one test case that requires it. Fixes #86 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>