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>
(transplanted from 139b85d70b623e51f7585e7c64ecb8c6a6cf4567)

 diff -durN ltrace-0.5.2.orig/configure ltrace-0.5.2/configure

 --- ltrace-0.5.2.orig/configure	2009-09-14 18:47:45.000000000 +0200

 +++ ltrace-0.5.2/configure	2009-09-14 18:49:18.000000000 +0200

 @@ -1829,6 +1829,9 @@

    linux-gnu*) host_os=linux-gnu

  esac

  HOST_OS="$host_os"

 +case "${HOST_OS}" in

 +  linux-*) HOST_OS=linux-gnu;;

 +esac

  ac_ext=c

 diff -durN ltrace-0.5.2.orig/configure.ac ltrace-0.5.2/configure.ac

 --- ltrace-0.5.2.orig/configure.ac	2009-09-14 18:47:45.000000000 +0200

 +++ ltrace-0.5.2/configure.ac	2009-09-14 18:49:18.000000000 +0200

 @@ -10,6 +10,9 @@

    linux-gnu*) host_os=linux-gnu

  esac

  HOST_OS="$host_os"

 +case "${HOST_OS}" in

 +  linux-*) HOST_OS=linux-gnu;;

 +esac

  AC_SUBST(HOST_OS)

  HOST_ARCH="$host_cpu"

  AC_SUBST(HOST_ARCH)