intel_performance_query: Build only if EGL is available.
In file included from tests/spec/intel_performance_query/issue_2235.c:34: tests/util/piglit-util-egl.h:28:10: fatal error: 'EGL/egl.h' file not found ^~~~~~~~~~~
Fixes: c85fad35 ("tests: add test for assert in INTEL_performance_query") Signed-off-by: Vinson Lee vlee@freedesktop.org