tests: Pass --internal and -z noexecstack to glib-compile-resources tests

This isn’t needed to make the tests any better (it doesn’t really affect them), but is probably needed for anyone who copies this Meson code in order to add glib-compile-resources support to their project. It’s pretty unlikely that someone would want to compile and export a resource from a shared library, or have it have an executable stack.

Inspired by gtk!4334 (merged) and gtk!4330 (merged).

Signed-off-by: Philip Withnall pwithnall@endlessos.org