generic: disable libpfring

Building this package breaks the builds. We do not require it, thus we
can simply disable it.

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit 1ff17a6a)

targets/generic

@@ -41,6 +41,8 @@ config('ALL_NONSHARED', true)
 try_config('PACKAGE_usbip', false) -- fails to build
 try_config('PACKAGE_coova-chilli', false) -- fails to build
 try_config('PACKAGE_kmod-ipt-coova', false) -- fails to build
+try_config('PACKAGE_libpfring', false) -- fails to build
+try_config('PACKAGE_kmod-pf-ring', false) -- fails to build
 
 try_config('PACKAGE_ATH_DEBUG', true)