package/vde2: does not build on static only, needs dlopen()

Fixes:
    http://autobuild.buildroot.net/results/f9d/f9d23455a138e2214546922486c03c9d3c35b04a/

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

package/vde2/Config.in

@@ -1,9 +1,14 @@
 config BR2_PACKAGE_VDE2
 	bool "vde2"
 	depends on BR2_USE_MMU # fork()
+	depends on !BR2_PREFER_STATIC_LIB # dlopen()
 	help
 	  VDE is an ethernet compliant virtual network that can be
 	  spawned over a set of physical computers over the Internet.
 	  VDE is part of the virtualsquare project.
 
 	  http://vde.sourceforge.net/
+
+comment "vde2 needs a toolchain w/ dynamic library"
+	depends on BR2_USE_MMU
+	depends on BR2_PREFER_STATIC_LIB