Re #1758: changing library name from libwels to libopenh264 in recent OpenH264 update

git-svn-id: http://svn.pjsip.org/repos/pjproject@4846 74dad513-b988-da41-8d7b-12977e46ad98
Misc (re #1751): Fixed build error when PJ_LOG_MAX_LEVEL is set to 0 (thanks Fredrik Hansson for the report).



git-svn-id: http://svn.pjsip.org/repos/pjproject@4847 74dad513-b988-da41-8d7b-12977e46ad98