Makefile: Allow overriding of CC
Makefile: Use C99 not GNU99
libbinddir.h: Always define LOG_ messages, only include {stdio,stdarg}.h in debug mode.
libbinddir.c: New errorf func, only prints in debug mode.
libbinddir.c: Use errorf function for debug messages.
libbinddir.c: Re-indent switch statements after fixing vim config.