pass CC to make if set

tools/isolinux.bin.update

@@ -24,7 +24,9 @@ cd $PKG
 sed -i -r "s:/boot/syslinux:/$LIVEKITNAME/boot:" core/fs/iso9660/iso9660.c
 sed -i -r "s:/boot/syslinux:/$LIVEKITNAME/boot:" core/fs/lib/loadconfig.c
 
-make
+make \
+	${CC:+CC="$CC"}
+
 cp -p core/isolinux.bin ../../bootfiles/isolinux.bin
 
 echo