Remove setting of long-unused MK_NCP option

NCP was removed from the tree in 2013 (r248097) and disconnected some
time before.

Reported by:	bz
Sponsored by:	The FreeBSD Foundation

release/Makefile

@@ -194,7 +194,7 @@ disc1: packagesystem
 	cd ${WORLDDIR} && ${IMAKE} installkernel installworld distribution \
 	    DESTDIR=${.OBJDIR}/${.TARGET} MK_AMD=no MK_AT=no \
 	    MK_INSTALLLIB=no MK_LIB32=no MK_MAIL=no \
-	    MK_NCP=no MK_TOOLCHAIN=no MK_PROFILE=no \
+	    MK_TOOLCHAIN=no MK_PROFILE=no \
 	    MK_RESCUE=no MK_DICT=no \
 	    MK_KERNEL_SYMBOLS=no MK_TESTS=no MK_DEBUG_FILES=no \
 	    -DDB_FROM_SRC
@@ -224,7 +224,7 @@ bootonly: packagesystem
 	    DESTDIR=${.OBJDIR}/${.TARGET} MK_AMD=no MK_AT=no \
 	    MK_GAMES=no \
 	    MK_INSTALLLIB=no MK_LIB32=no MK_MAIL=no \
-	    MK_NCP=no MK_TOOLCHAIN=no MK_PROFILE=no \
+	    MK_TOOLCHAIN=no MK_PROFILE=no \
 	    MK_RESCUE=no MK_DICT=no \
 	    MK_KERNEL_SYMBOLS=no MK_TESTS=no MK_DEBUG_FILES=no \
 	    -DDB_FROM_SRC