Meson: Pick libxkbcommon from Git, remove patch dir

Improvements needed to build libxkbcommon as subproject have been
merged in the upstream repository, so pick the first revision known
to work without needing a local patch dir.

Author: aperezdc

subprojects/libxkbcommon.wrap

@@ -1,6 +1,3 @@
-[wrap-file]
-directory = libxkbcommon-1.2.1
-source_url = https://xkbcommon.org/download/libxkbcommon-1.2.1.tar.xz
-source_filename = libxkbcommon-1.2.1.tar.xz
-source_hash = e833a7d3024c9bb9d5eb2b20f6d5de08865541f21bb7ba227c83cbd236691fb3
-patch_directory = libxkbcommon-1.2.1
+[wrap-git]
+revision = 9d87f8491595e0a6bd2d8b3eff266712c9b5c63d
+url = https://github.com/xkbcommon/libxkbcommon