support compiling against system jpcre2 library
In Fedora, we have the JPCRE2 library (header) packaged system-wide, so it would be nice to have the option to compile mkvtoolnix using that version instead of the bundled one in lib/jpcre2.
In Fedora, we have the JPCRE2 library (header) packaged system-wide, so it would be nice to have the option to compile mkvtoolnix using that version instead of the bundled one in lib/jpcre2.