jack2: not available for static only builds

Fixes:
http://autobuild.buildroot.net/results/e53/e537a500852ddb8aa0b1155ea9bc8a17636dd50d/

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

package/jack2/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_JACK2
 	depends on BR2_USE_MMU # fork()
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_ARCH_HAS_ATOMICS
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_LIBSAMPLERATE
 	select BR2_PACKAGE_LIBSNDFILE
 	select BR2_PACKAGE_ALSA_LIB
@@ -20,7 +21,8 @@ config BR2_PACKAGE_JACK2
 
 	  http://jackaudio.org/
 
-comment "jack2 needs a toolchain w/ threads, C++"
+comment "jack2 needs a toolchain w/ threads, C++, dynamic library"
 	depends on BR2_USE_MMU
 	depends on BR2_ARCH_HAS_ATOMICS
-	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
+		BR2_STATIC_LIBS

package/mpd/Config.in

@@ -226,10 +226,14 @@ config BR2_PACKAGE_MPD_AO
 config BR2_PACKAGE_MPD_JACK2
 	bool "jack2"
 	depends on BR2_ARCH_HAS_ATOMICS
+	depends on !BR2_STATIC_LIBS # jack2
 	select BR2_PACKAGE_JACK2
 	help
 	  Enable jack output support.
 
+comment "jack support needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
+
 config BR2_PACKAGE_MPD_OSS
 	bool "oss"
 	help