[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.