meson.build: fix intel atomics detection

Use the stronger compiler.link() test (instead of the weaker compiler.compile()) to fix the intel atomics detection.

Fixes false positive in case of sparc compile (buildroot toolchain).

Signed-off-by: Peter Seiderer ps.report@gmx.net

Notes:

• resend via gitlab pull request, original posted to dri-devel mailing list (see [1])

[1] https://lists.freedesktop.org/archives/dri-devel/2018-July/183885.html