[cache] Signature fixes.

* src/cache/ftcglyph.c, src/cache/ftcglyph.h (FTC_GNode_Compare): Remove
redundant function.  It is equivalent to `ftc_gnode_compare` and becomes
completely meaningless with fixed signatures.
Update all callers.

* src/cache/ftcsbits.c, src/cache/ftcsbits.h (FTC_SNode_Compare): Remove
redundant function.  It is equivalent to `ftc_snode_compare` and becomes
completely meaningless with fixed signatures.
Update all callers.
5 files changed