build: Remove spurious Makefile.am
build: Remove spurious Makefile.am

These days cogl/ has a non-recursive Makefile.am and an old one was
still present in cogl/driver.

Reviewed-by: Neil Roberts <822ec91a7ef82248fd36162ca8ac3283eba70848@linux.intel.com>

djdeath/cogl-android,djdeath/cogl-android,djdeath/cogl,gcampax/cogl,gcampax/cogl,djdeath/cogl-android,djdeath/cogl,gcampax/cogl,gcampax/cogl,djdeath/cogl