core: fix warning bugs on unused vars introduced by the last commit
support -extra level version for pkgconfig. this is useful when we release bugfix version
Merge branch 'master' into next
fix typo for vsnprintf in config.mk
only turn off some string check functions with _FORTIFY_SOURCE=0 for OSX when USE_SYS_DYN_MEM=yes
ppc: correct a comment on IMM operand in ppc.h
cleanup x86.h & mips.h (C-IMM)
indentation for ppc.h