meson: build a full dependency for lib_igt_perf

meson prefers packages dependencies over passing arount static
libraries, because those also include linker flags, include dirs and
everything else.

While at it pull the special cases out from the common build stanzas
like we do with other special cases.

Just a bit of ocd to keep everything polished.

v2: Don't forget to add perf_pmu to the test list (Petri).

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>