freerdp: needs shared library

Fixes:
http://autobuild.buildroot.net/results/e5d/e5dee5220cbda69e4085cbddc842c7512d500163/
http://autobuild.buildroot.net/results/edf/edf03933caa8dc35cc42bbdd14cd83c1fb952a4f/
http://autobuild.buildroot.net/results/4cf/4cf8b172f7d662aa46d359ed56572afbdccf1d85/
http://autobuild.buildroot.net/results/d39/d3922966e951f929615654e58c36bc05775fa22a/

And many more.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/freerdp/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_FREERDP
 	bool "freerdp"
 	depends on BR2_USE_WCHAR
+	depends on !BR2_STATIC_LIBS # uses dlfcn.h
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_ZLIB
 	help
@@ -39,5 +40,5 @@ comment "freerdp server and client need X.Org"
 
 endif
 
-comment "freerdp needs a toolchain w/ wchar"
-	depends on !BR2_USE_WCHAR
+comment "freerdp needs a toolchain w/ wchar, dynamic library"
+	depends on !BR2_USE_WCHAR || BR2_STATIC_LIBS