libpfring: add new package

PF_RING is a high speed packet capture library that turns a commodity PC into an efficient and cheap
network measurement box suitable for both packet and active traffic analysis and manipulation.
Moreover, PF_RING opens totally new markets as it enables the creation of efficient application such as
traffic balancers or packet filters in a matter of lines of codes.

github : https://github.com/ntop/pf_ring
official : https://www.ntop.org

Signed-off-by: BangLang Huang <banglang.huang@foxmail.com>
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
[rename kmod-pfring to kmod-pf-ring]

libs/libpfring/patches/0001-fix-cross-compiling.patch

@@ -0,0 +1,32 @@
+--- a/userland/configure
++++ b/userland/configure
+@@ -3745,12 +3745,6 @@ fi
+ if test "$IS_FREEBSD" != "1"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking if r/w locks are supported" >&5
+ $as_echo_n "checking if r/w locks are supported... " >&6; }
+-  if test "$cross_compiling" = yes; then :
+-  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+-as_fn_error $? "cannot run test program while cross compiling
+-See \`config.log' for more details" "$LINENO" 5; }
+-else
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ 
+@@ -3763,7 +3757,7 @@ else
+ 
+ 
+ _ACEOF
+-if ac_fn_c_try_run "$LINENO"; then :
++if ac_fn_c_try_compile "$LINENO"; then :
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+ $as_echo "yes" >&6; }
+ cat >>confdefs.h <<_ACEOF
+@@ -3777,7 +3771,6 @@ $as_echo "no" >&6; }
+ fi
+ rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+   conftest.$ac_objext conftest.beam conftest.$ac_ext
+-fi
+ 
+ fi
+