locale: use include directory for libxkbcommon

To support the case the headers are installed at an unusual place.

meson.build

@@ -1457,6 +1457,7 @@ conf.set10('HAVE_LIBARCHIVE_HARDLINK_IS_SET',
 libxkbcommon = dependency('xkbcommon',
                           version : '>= 0.3.0',
                           required : get_option('xkbcommon'))
+libxkbcommon_cflags = libxkbcommon.partial_dependency(includes: true, compile_args: true)
 conf.set10('HAVE_XKBCOMMON', libxkbcommon.found())
 
 libpcre2 = dependency('libpcre2-8',

src/locale/meson.build

@@ -19,7 +19,7 @@ localectl_sources = files('localectl.c')
 if conf.get('HAVE_XKBCOMMON') == 1
         libxkbcommon_deps = [
                 libdl,
-                libxkbcommon.partial_dependency(compile_args: true),
+                libxkbcommon_cflags,
         ]
 else
         libxkbcommon_deps = []