Following up with the dso.h drop, this follows in the same footsteps using -fno-semantic-interposition and a linker map script. Libsepol already had a linker map, so nothing to do there, I just had to add the -fno-semantic-interposition. Also, in keeping with similair behavior to libselinux, I set the option on the overridable CFLAGS. [PATCH 1/2] libsepol/dso: drop hidden_proto and hidden_def [PATCH 2/2] libsepol/Makefile: add -fno-semantic-interposition
