dist: Make sure to dist cogl-winsys-egl-feature-functions.h
dist: Make sure to dist cogl-winsys-egl-feature-functions.h

cogl-winsys-egl-feature-functions.h wasn't being listed as source and so
it wasn't ending up in dist tarballs.

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

Distrotech/cogl,gcampax/cogl,djdeath/cogl,spatulasnout/cogl,djdeath/cogl-android,gcampax/cogl,gcampax/cogl,Distrotech/cogl,Distrotech/cogl,djdeath/cogl-android,spatulasnout/cogl,djdeath/cogl-android,collects/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl,djdeath/cogl,collects/cogl