src/libpcp_web/src/GNUmakefile: disable building discover.c
src/libpcp_web/src/GNUmakefile: disable building discover.c

Until build issues are resolved.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp