glsl: remove redundant record_compare check when linking globals

glsl: remove redundant record_compare check when linking globals

Unnamed struct types are now equal across stages based on the fields they
contain, so overriding the type to make sure names match has become
unnecessary.

The check was originally introduced in commit 955c93dc089f ("glsl: Match
unnamed record types across stages.")

v2: clarify the commit message

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>