Changes needed to get GnuPG estream.c to compile with the Studio C compiler.

These were legitimate bugs in GnuPG version 2.0.22, but looking at the
latest version of estream.c in the GnuPG git repository, the problems have
been resolved by redefining ESTREAM_MUTEX_UNLOCK and ESTREAM_MUTEX_INITIALIZE
to no longer test against estream_pth_killed and therefore no need for the
bogusly defined dummy routines.

--- gnupg-2.0.22/common/estream.c.orig	2014-01-15 08:38:06.978672664 -0800
+++ gnupg-2.0.22/common/estream.c	2014-01-15 09:02:39.386197974 -0800
@@ -181,13 +181,13 @@
   (estream_pth_killed ? dummy_mutex_call_void ((mutex))         \
    : (void)pth_mutex_acquire (&(mutex), 0, NULL))
 # define ESTREAM_MUTEX_UNLOCK(mutex)                            \
-  (estream_pth_killed ? dummy_mutex_call_void ((mutex))         \
+  (estream_pth_killed ? dummy_mutex_call_int ((mutex))         \
    : pth_mutex_release (&(mutex)))
 # define ESTREAM_MUTEX_TRYLOCK(mutex)                                   \
   (estream_pth_killed ? dummy_mutex_call_int ((mutex))                  \
    : ((pth_mutex_acquire (&(mutex), 1, NULL) == TRUE)? 0:-1))
 # define ESTREAM_MUTEX_INITIALIZE(mutex)                        \
-  (estream_pth_killed ? dummy_mutex_call_void ((mutex))         \
+  (estream_pth_killed ? dummy_mutex_call_int ((mutex))         \
    : pth_mutex_init (&(mutex)))
 
 #else /*!HAVE_PTH*/