hg: ppc-aix-port/jdk7u/jdk: Export 'USE_PTHREADS' on Linux trough CPPFLAGS to fix the build because java_md_solinux.c now only relies on 'USE_PTHREADS' beeing defined.

[volker.simonis at gmail.com]

Changeset: 35172a51cc76
Author:    simonis
Date:      2012-07-16 19:54 +0200
URL:       http://hg.openjdk.java.net/ppc-aix-port/jdk7u/jdk/rev/35172a51cc76

Export 'USE_PTHREADS' on Linux trough CPPFLAGS to fix the build because java_md_solinux.c now only relies on 'USE_PTHREADS' beeing defined.

! make/common/Defs-linux.gmk
! src/solaris/bin/java_md_solinux.c