rpm: only show xz dependency comment if enabled

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/rpm/Config.in

@@ -15,16 +15,16 @@ config BR2_PACKAGE_RPM
 
 	  http://rpm5.org
 
+if BR2_PACKAGE_RPM
+
 config BR2_PACKAGE_RPM_BZIP2_PAYLOADS
 	bool "support for bzip2 payloads"
-	depends on BR2_PACKAGE_RPM
 	select BR2_PACKAGE_BZIP2
 	help
 	  Support for bzip2 payloads in RPM.
 
 config BR2_PACKAGE_RPM_XZ_PAYLOADS
 	bool "support for xz payloads"
-	depends on BR2_PACKAGE_RPM
 	depends on BR2_INSTALL_LIBSTDCPP
 	help
 	  Support for xz payloads in RPM.
@@ -32,4 +32,6 @@ config BR2_PACKAGE_RPM_XZ_PAYLOADS
 comment "xz payload support requires a toolchain with c++ support"
 	depends on !BR2_INSTALL_LIBSTDCPP
 
+endif
+