Fix regex_traits<T>::char_class_type for Android.

Android can't use ctype_base::mask for its char_class_type because the
bionic ctype implementation comes from openbsd, which uses an 8-bit
ctype mask which isn't large enough to encode the standard ctypes and
__regex_word.

Change-Id: Iee4b8dd465ff2cb358ed2b10e1c3a499437403b7
1 file changed