package/bullet: needs dynamic library

Build without dlfcn.h fails because bullet3 is not disabled since
commit 5f154799b6ed772a0c028072996e110fac131508

Fixes:
 - http://autobuild.buildroot.org/results/ab2efdd1eac64474adf00d8e60b42110c6e89143

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/bullet/Config.in

@@ -1,11 +1,12 @@
 config BR2_PACKAGE_BULLET
 	bool "bullet"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_STATIC_LIBS # dlfcn.h
 	help
 	  Bullet is a Collision Detection and Rigid Body Dynamics
 	  Library.
 
 	  http://bulletphysics.org
 
-comment "bullet needs a toolchain w/ C++"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "bullet needs a toolchain w/ C++, dynamic library"
+	depends on !BR2_INSTALL_LIBSTDCPP || BR2_STATIC_LIBS