gcc: update to 7.1 with tools * src/build-gcc.mk: update version 7.1.0 * src/cloog.mk: update 0.18.4 * src/gmp.mk: update 6.1.2 * src/isl.mk: update 0.16.1, add no-undefined flag * src/mpfr.mk: update 3.1.6 * src/native-gcc.mk: update 7.1.0 * src/isl-1-fixes.patch: removed file * dist-files.mk: remove reference to patch files, add mingw-w64 patch * src/build-gcc-1-mingw-float.patch: removed patch * src/native-gcc-1-mingw-float.patch: removed patch * src/build-gcc-2-intrinsics.patch: removed patch * src/native-gcc-2-intrinsics.patch: removed patch * src/mingw-w64.mk: update to 5.0.2 * src/gcc-1-mingw-float.patch: remove patch * src/gcc-2-darwin-no-pie.patch: remove patch * src/mingw-w64-2-pthreads.patch: new file * src/pthreads.mk: apply mingw patches to mingw sources before running configure

This file is part of MXE.
See index.html for further information.

Patch taken from http://sourceforge.net/mailarchive/message.php?msg_id=27995461

mingwrt 3.20 provides ssize_t and defines _SSIZE_T_. This patch
allows libdnet to use this ssize_t instead of defining its
own which causes build failure. Applies to libdnet 1.11.

diff --git a/include/dnet/os.h b/include/dnet/os.h
index c12c7b2..9e8bdd2 100644
--- a/include/dnet/os.h
+++ b/include/dnet/os.h
@@ -23,8 +23,10 @@
   typedef u_short	uint16_t;
   typedef u_int		uint32_t;
 # ifndef __CYGWIN__
+# ifndef _SSIZE_T_
   typedef long		ssize_t;
 # endif
+# endif
 #else
 # include <sys/param.h>
 # include <sys/types.h>
-- 
1.7.6