pkg: correct bind version according to ABI

(cherry picked from commit 339f1301)

Makefile

@@ -46,9 +46,11 @@ CORE_ARCH?=	${ARCH}
 CORE_PY?=	27
 
 .if ${CORE_ABI} == 16.7
+CORE_BIND?=	910
 CORE_PHP_SUHOSIN=php-suhosin
 CORE_PHP?=	56
 .else
+CORE_BIND?=	911
 CORE_PHP?=	70
 .endif
 
@@ -77,7 +79,7 @@ CORE_MESSAGE?=		Thanks for all the fish...
 CORE_DEPENDS_amd64?=	beep bsdinstaller
 CORE_DEPENDS_i386?=	${CORE_DEPENDS_amd64}
 CORE_DEPENDS?=		apinger \
-			bind910 \
+			bind${CORE_BIND} \
 			bsnmp-regex \
 			bsnmp-ucd \
 			ca_root_nss \