python-cffi: remove BROKEN status

Pull requests #2455 and #2463 should have fixed python-cffi.

Additionally r48918 has decreased the risk from broken host sections
to buildbot builds: https://dev.openwrt.org/changeset/48918

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

lang/python-cffi/Makefile

@@ -33,7 +33,7 @@ define Package/python-cffi
 	SUBMENU:=Python
 	TITLE:=python-cffi
 	URL:=http://cffi.readthedocs.org/
-	DEPENDS:=+libffi +python-light +python-pycparser @BROKEN
+	DEPENDS:=+libffi +python-light +python-pycparser
 endef
 
 define Package/python-cffi/description