complibs/ppl: fix 0.11-0.11.2 to compile with --disable-shared

PPL 0.11 (through 0.11.2) had a small bug where it still tried to build
and test its Java interface even when shared libraries are disabled.
Since that's exactly what ct-ng does, it explodes.

This is the patch from the PPL authors (see final link below).

More information can be found in these messages/threads:

Anthony's initial report and analysis with Yann:
http://www.cygwin.com/ml/crossgcc/2011-05/msg00046.html

Ron Flory hit the same problem:
http://www.cygwin.com/ml/crossgcc/2011-05/msg00054.html

Anthony's report to the ppl-devel list:
http://www.cs.unipr.it/pipermail/ppl-devel/2011-May/017450.html

Roberto's reply with a link to the fix in the PPL git repo:
http://www.cs.unipr.it/pipermail/ppl-devel/2011-May/017455.html

Signed-Off-By: Anthony Foiani <anthony.foiani@gmail.com>

 many ports hit this warning:

 ../sysdeps/unix/sysv/linux/check_native.c:46: warning: implicit declaration of function 'memset'

 ../sysdeps/unix/sysv/linux/check_native.c:46: warning: implicit declaration of function 'memset'

 snipped from suse

 diff -durN glibc-2.13.orig/sysdeps/unix/sysv/linux/check_native.c glibc-2.13/sysdeps/unix/sysv/linux/check_native.c

 --- glibc-2.13.orig/sysdeps/unix/sysv/linux/check_native.c	2007-11-24 04:12:17.000000000 +0100

 +++ glibc-2.13/sysdeps/unix/sysv/linux/check_native.c	2009-11-13 00:50:11.000000000 +0100

 @@ -23,6 +23,7 @@

  #include <stddef.h>

  #include <stdint.h>

  #include <stdlib.h>

 +#include <string.h>

  #include <time.h>

  #include <unistd.h>

  #include <net/if.h>