shellinabox: add dependency on !BR2_STATIC_LIBS

shellinabox uses <dlfcn.h>, so a !BR2_STATIC_LIBS dependency is needed.

Fixes:

  http://autobuild.buildroot.net/results/59dd88e31a5f49231c4131b840fbf1bb76e777e7/

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

package/shellinabox/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_SHELLINABOX
 	bool "shellinabox"
 	depends on BR2_USE_MMU # fork()
+	depends on !BR2_STATIC_LIBS # dlfcn.h
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_ZLIB
 	help
@@ -11,3 +12,7 @@ config BR2_PACKAGE_SHELLINABOX
 	  browser plugins.
 
 	  https://github.com/shellinabox/shellinabox
+
+comment "shellinabox needs a toolchain w/ dynamic library"
+	depends on BR2_USE_MMU
+	depends on BR2_STATIC_LIBS