canfestival: disable static build

canfestival doesn't really support static build. The configure script accepts
the --disable-dll parameter that should in theory allow a static build. In
practice this options is not well tested, as it causes the build to fails in
various places.

Fixes:
http://autobuild.buildroot.net/results/29f/29fd3e550937f48e2270149a3d44cfb8bcf5c16a/

Cc: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/canfestival/Config.in

@@ -2,14 +2,15 @@ config BR2_PACKAGE_CANFESTIVAL_ARCH_SUPPORTS
 	bool
 	default y if BR2_i386 || BR2_x86_64 || BR2_powerpc || BR2_arm
 
-comment "canfestival needs a toolchain w/ threads"
+comment "canfestival needs a toolchain w/ threads and dynamic library"
 	depends on BR2_PACKAGE_CANFESTIVAL_ARCH_SUPPORTS
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_PREFER_STATIC_LIB
 
 config BR2_PACKAGE_CANFESTIVAL
 	bool "canfestival"
 	depends on BR2_PACKAGE_CANFESTIVAL_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_PREFER_STATIC_LIB
 	help
 	  CanFestival is an OpenSource CANOpen framework, licensed under
 	  LGPLv2.1 and GPLv2 for some drivers (virtual_kernel, lincan and