libcap-ng: disable on avr32 which lacks TLS

libcap-ng needs TLS support, which is not available on avr32.
Also, disable reverse dependencies.

Fixes:
  http://autobuild.buildroot.net/results/73c/73c7c211a51c312bbe4eb6a540f3ad9c92c79ebe/

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libcap-ng/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_LIBCAP_NG
 	bool "libcap-ng"
+	depends on !BR2_avr32 # lacks TLS
 	help
 	  The libcap-ng library is intended to make programming with
 	  posix capabilities much easier than the traditional libcap

package/ofono/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_OFONO
 	depends on BR2_USE_WCHAR # gettext, libglib2
 	depends on BR2_TOOLCHAIN_HAS_THREADS # dbus, libglib2
 	depends on BR2_USE_MMU # dbus, libglib2
+	depends on !BR2_avr32 # libcap-ng
 	select BR2_PACKAGE_LIBCAP_NG
 	select BR2_PACKAGE_DBUS
 	select BR2_PACKAGE_LIBGLIB2
@@ -15,5 +16,6 @@ config BR2_PACKAGE_OFONO
 	  http://ofono.org/
 
 comment "ofono needs a toolchain w/ wchar, threads"
+	depends on !BR2_avr32
 	depends on BR2_USE_MMU
 	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS