Revision 403070

devel/efivar: unbreak build on DragonFly

Don't rely on USE_GCC using implicit -isystem/usr/local/include to fix

efivar.c:20:18: fatal error: popt.h: No such file or directory

Approved by:	portmgr blanket
Reported by:	http://muscles.dragonflybsd.org/bulk/latest-per-pkg/efivar/