libuv: not available for static only builds

Fixes:
http://autobuild.buildroot.net/results/031/031c2c005f4946af5012be7432b55d11ca891d60/

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

package/libuv/Config.in

@@ -2,12 +2,13 @@ config BR2_PACKAGE_LIBUV
 	bool "libuv"
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
+	depends on !BR2_STATIC_LIBS
 	help
 	  libuv is a multi-platform support library with a focus
 	  on asynchronous I/O.
 
 	  https://github.com/libuv/libuv
 
-comment "libuv needs a toolchain w/ threads"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
+comment "libuv needs a toolchain w/ threads, dynamic library"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
 	depends on BR2_USE_MMU