meson.build/libweston: Fix clang warning for export-dynamic

Identical to 8a8558dd, where we need to pass `-Wl` as linker args.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

libweston/meson.build

@@ -79,7 +79,7 @@ lib_weston = shared_library(
 	'weston-@0@'.format(libweston_major),
 	srcs_libweston,
 	include_directories: include_directories('..', '../shared'),
-	link_args: [ '-export-dynamic' ],
+	link_args: [ '-Wl,-export-dynamic' ],
 	install: true,
 	version: '0.0.@0@'.format(libweston_revision),
 	link_whole: lib_libshared,