Merge branch 'jn/maint-do-not-match-with-unsanitized-searchtext' into maint

"gitweb" did use quotemeta() to prepare search string when asked to
do a fixed-string project search, but did not use it by mistake and
used the user-supplied string instead.

By Jakub Narebski
* jn/maint-do-not-match-with-unsanitized-searchtext:
  gitweb: Fix fixed string (non-regexp) project search