[C++] Always glob wildcards in stamp file
[C++] Always glob wildcards in stamp file

glob(3) is not very slow so it is OK to always run them. Also
ignore globs specified by --ignore_optional_include_pattern.

colincross/kati,shinh/kati,google/kati,pombredanne/kati,shinh/kati,shinh/kati,pombredanne/kati,google/kati,shinh/kati,danw/kati,danw/kati,pombredanne/kati,danw/kati,pombredanne/kati,google/kati,danw/kati,google/kati,danw/kati,colincross/kati,colincross/kati,colincross/kati,shinh/kati,colincross/kati,google/kati,danw/kati,pombredanne/kati,shinh/kati,pombredanne/kati,colincross/kati