rpm: disable static build support

The RPM package requires dynamic linking support (dlfcn.h) for its
capabilities related to plugins (and possibly more). The following
commit adds a dependency to !BR2_STATIC_LIBS.

Signed-off-by: James Knight <james.knight@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/rpm/Config.in

@@ -1,10 +1,11 @@
-comment "rpm needs a toolchain w/ threads"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
+comment "rpm needs a toolchain w/ dynamic library and threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
 	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
 	depends on BR2_USE_MMU
 
 config BR2_PACKAGE_RPM
 	bool "rpm"
+	depends on !BR2_STATIC_LIBS # dlfcn.h
 	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
 	depends on BR2_TOOLCHAIN_HAS_THREADS # beecrypt
 	depends on BR2_USE_MMU # fork()