zip: don't link libbz2 even if its there

Signed-off-by: Steven Barth <steven@midlink.org>

utils/zip/Makefile

@@ -49,6 +49,7 @@ define Build/Compile
 		CFLAGS="$(TARGET_CFLAGS)" \
 		CC="$(TARGET_CC) $(TARGET_CFLAGS) -O $(TARGET_CPPFLAGS) -I. -DUNIX" \
 		LD="$(TARGET_CC) $(TARGET_LDFLAGS)" \
+		IZ_BZIP2="no" \
 		install
 endef