ffsll name conflicts with cstring ffsll

Issue #35 resolved
Asim Yarkhan created an issue

ffsll can conflict with the same function name declared in /usr/include/c++/5/cstring:42:0. Problem reported by Steffen Zeh

perfapi-devel: https://groups.google.com/a/icl.utk.edu/forum/#!topic/perfapi-devel/8PG_Cl3bcgE