sysutils/u-boot-master: Test for broken u-boot only if FAMILY is defined

Otherwise the u-boot-master metaport throw an error.

Reported by:  dvl
Fixes:	      ebfb1be

sysutils/u-boot-master/Makefile

@@ -250,8 +250,10 @@ do-install:
 
 .include <bsd.port.options.mk>
 
+.if defined(FAMILY)
 .if ${FAMILY} == qemu && ${OPSYS} == FreeBSD && ${OSVERSION} <= 1200000
 BROKEN=		Base openssl too old
 .endif
+.endif
 
 .include <bsd.port.mk>