Merge pull request swiftlang#64 from dgrove-oss/bugfix2-libpwq-configure

Another fix for libpwq configuration

Author: MadCoder

configure.ac

@@ -187,7 +187,7 @@ AS_IF([test -f $srcdir/libpwq/configure.ac],
   [AC_DEFINE(BUILD_OWN_PTHREAD_WORKQUEUES, 1, [Define if building pthread work queues from source])
    ac_configure_args="--disable-libpwq-install $ac_configure_args"
    AC_CONFIG_SUBDIRS([libpwq])
-   build_own_pthread_workqueues=true,
+   build_own_pthread_workqueues=true
    AC_DEFINE(HAVE_PTHREAD_WORKQUEUES, 1, [Define if pthread work queues are present])
    have_pthread_workqueues=true],
   [build_own_pthread_workqueues=false