Issue #12571: Add a plat-linux3 directory mirroring the plat-linux2 directory,
so that "import DLFCN" and other similar imports work on Linux 3.0.
diff --git a/Lib/plat-linux3/regen b/Lib/plat-linux3/regen
new file mode 100755
index 0000000..c76950e
--- /dev/null
+++ b/Lib/plat-linux3/regen
@@ -0,0 +1,8 @@
+#! /bin/sh
+case `uname` in
+Linux*) ;;
+*) echo Probably not on a Linux system 1>&2
+ exit 1;;
+esac
+set -v
+h2py -i '(u_long)' /usr/include/sys/types.h /usr/include/netinet/in.h /usr/include/dlfcn.h