* include/freetype/cache/ftcglyph.h, src/cache/ftcglyph.c: fixed a dangling pointer bug that happened in very rare cases: i.e. when a new family object was destroyed by an out-of-memory condition during a glyph node initialization. The function FTC_Cache_Lookup would flush the cache and restart the lookup with a bad pointer. * src/cache/ftcmanag.c: fixed a cache flushing bug