package/rpm: add missing kconfig dependency to zlib

Since we build-depend on zlib, forcibly select it from kconfig.

This went unnoticed so far, because we did select openssl which
in turn selects zlib. But rpm needs zlib for itself, too.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <jacmet@uclibc.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rpm/Config.in

@@ -13,6 +13,7 @@ config BR2_PACKAGE_RPM
 	select BR2_PACKAGE_NEON_XML
 	select BR2_PACKAGE_NEON_ZLIB
 	select BR2_PACKAGE_NEON_SSL
+	select BR2_PACKAGE_ZLIB
 	help
 	  The RPM package management system.