netatalk: needs dynamic library

Even though netatalk checks if dlfcn.h is available and has some code
that supposedly copes with non-dynamic library cases, it in fact does
not build. Since there is probably little interest in using netatalk
in pure statically linked environments, let's simply require dynamic
library support.

Fixes:

  http://autobuild.buildroot.net/results/79e55e64885d64392407e830560175c556953a20/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/netatalk/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_NETATALK
 	bool "netatalk"
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_BERKELEYDB
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_LIBEVENT
@@ -13,6 +14,6 @@ config BR2_PACKAGE_NETATALK
 
 	  http://netatalk.sourceforge.net/
 
-comment "netatalk needs a toolchain w/ threads"
+comment "netatalk needs a toolchain w/ threads, dynamic library"
 	depends on BR2_USE_MMU
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS