[truetype] Fix compilation without bytecode.

Fixes #1351 and various warnings about unused variables.

* src/truetype/ttinterp.c: Put the entire body under #ifdef.
* src/truetype/ttgload.c (TT_Process_Composite_Glyph): Relocate
some declarations.
* src/truetype/ttinterp.h: Remove some #ifdef conditions.
* src/truetype/ttobjs.c (tt_size_done): Modified.
4 files changed