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)

 commit 25bb77587944768581225d1c0048facab32cf019

 Author: Roberto Bagnara <bagnara@cs.unipr.it>

 Date:   Wed May 18 09:35:36 2011 +0200

     Moved misplaced conditional.

 diff --git a/interfaces/Java/tests/Makefile.am b/interfaces/Java/tests/Makefile.am

 index 64ba864..607bbc6 100644

 --- a/interfaces/Java/tests/Makefile.am

 +++ b/interfaces/Java/tests/Makefile.am

 @@ -51,6 +51,8 @@ Parma_Polyhedra_Library_test2.java \

  PPL_Test.java \

  ppl_java_tests_common

 +if ENABLE_SHARED

 +

  check_JAVA = \

  ppl_java_generated_tests.java \

  Test_Executor.java \

 @@ -62,8 +64,6 @@ Parma_Polyhedra_Library_test1.java \

  Parma_Polyhedra_Library_test2.java \

  PPL_Test.java

 -if ENABLE_SHARED

 -

  CLASSPATH = ../ppl_java.jar:.

  JAVACFLAGS = -classpath $(CLASSPATH)