src/libpcp/src/interp.c: rename l_name in cache_t to c_name
src/libpcp/src/interp.c: rename l_name in cache_t to c_name

Avoid confusing name clash with l_name from __pmLogCtl.

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