package/physfs: needs threads support

When physfs is built for a Linux system the PHYSFS_PLATFORM_POSIX (which
enable code that use pthread_*()) symbol must be defined, so threads support
is required.  The physfs build system used by the previous version didn't
correctly set PHYSFS_PLATFORM_POSIX for system without pthread support.

Add pthread dependency.

Fixes:
http://autobuild.buildroot.org/results/75d/75d68ff9da42d61f47d80b463445c12bc51ed1a4

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/physfs/Config.in

@@ -1,10 +1,11 @@
 config BR2_PACKAGE_PHYSFS
 	bool "physfs"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  PhysicsFS; a portable, flexible file i/o abstraction.
 
 	  http://icculus.org/physfs
 
-comment "physfs needs a toolchain w/ C++"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "physfs needs a toolchain w/ C++, threads"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS