cogl-gst: pedantic typo fix in pkg-config description
cogl-gst: pedantic typo fix in pkg-config description

Reviewed-by: Robert Bragg <12e9293ec6b30c7fa8a0926af42807e929c1684f@linux.intel.com>

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