xbps_api.h.in: don't redefine __{BEGIN,END}_DECLS; which is true on BSD.
xbps_api.h.in: don't redefine __{BEGIN,END}_DECLS; which is true on BSD.

datenwolf/xbps,ebfe/xbps,stpx/xbps,stpx/xbps,ebfe/xbps,datenwolf/xbps,ebfe/xbps,datenwolf/xbps,stpx/xbps