glob: Use enum for __glob_pattern_type result From a patch proposed by Adhemerval Zanella in: https://sourceware.org/ml/libc-alpha/2017-09/msg00212.html * lib/glob_internal.h (GLOBPAT_NONE, GLOBPAT_SPECIAL) (GLOBPAT_BACKSLASH, GLOBPAT_BRACKET): New constants. * lib/glob_internal.h (__glob_pattern_type): * lib/glob.c (glob): * lib/glob_pattern_p.c (__glob_pattern_p): Use them.