defined and "c" is always added to WANTLIB. Remove the check from
the module and add WANTLIB += c to the individual port Makefiles.
No changes in package signature, no other modules affected.
MESSAGE/UNMESSAGE. Add @extra lines in place of UNMESSAGE. Docs about
activating these have been rolled into the general PHP pkg-readmes file.
OK/feedback aja@ jasper@
