meson: inline inc_common

Let's make it clear what includes are being added everywhere, so that
they can be cleaned up.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4360>

src/util/tests/string_buffer/meson.build

@@ -25,7 +25,7 @@ test(
     'string_buffer_test.cpp',
     cpp_args : [cpp_msvc_compat_args],
     dependencies : [idep_gtest, idep_mesautil],
-    include_directories : inc_common,
+    include_directories : [inc_include, inc_src, inc_mapi, inc_mesa, inc_gallium, inc_gallium_aux],
   ),
   suite : ['util'],
 )