cogl: Remove no-op cogl_shader_compile and cogl_shader_get_info_log

GNOME/mutter!1024
5 jobs for !1024 with cogl-shader-compile in 11 minutes and 18 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Review
passed #589217
check-commit-log

00:00:21

 
  Build
passed #589218
build-mutter

00:06:39

passed #589219
build-without-native-backend-and-wayland

00:06:04

 
  Test
passed #589221
can-build-gnome-shell

00:02:21

passed #589220
test-mutter

00:04:16