These options can be used to override the values returned by pcre-config, e.g.
to build using a static PCRE library even if pcre-config prefers to use the
shared one by default.
Use the updated AX_PATH_GENERIC macro from autoconf archive which was fixed to
allow the options set by the user to override the ones returned by pcre-config
(in fact, pcre-config isn't even called at all if these options are set).
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12548 626c5289-ae23-0410-ae9c-e8d60b6d4f22