rpi-userland: not available for static only builds

Fixes:
http://autobuild.buildroot.net/results/e9e/e9ea569b5fe6fd875b3fa8f4eee82e3fddd95e90/
http://autobuild.buildroot.net/results/c97/c97f7df043469bc51ebbb41ddf30f8e82d4e6bb5/
http://autobuild.buildroot.net/results/ba8/ba82769109f205123834627bbf782bd1811ea43e/

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

package/rpi-userland/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_RPI_USERLAND
 	depends on BR2_arm
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_HAS_LIBEGL
 	select BR2_PACKAGE_HAS_LIBGLES
 	select BR2_PACKAGE_HAS_LIBOPENVG
@@ -39,6 +40,7 @@ config BR2_PACKAGE_RPI_USERLAND_START_VCFILED
 
 endif
 
-comment "rpi-userland needs a toolchain w/ C++, threads"
+comment "rpi-userland needs a toolchain w/ C++, threads, dynamic library"
 	depends on BR2_arm
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || \
+		BR2_STATIC_LIBS