configure: only install khrplatform.h if needed

khrplatform.h is only used by EGL and GLES; let's only install it when
one of those is enabled.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
2 files changed