[bug-gv] libzio support incomplete

[Michael Shigorin]

        Hello,
I've noted that gv-3.7.4 built with libzio-1.02 wouldn't open
a .ps.xz file that it would accept just fine if recompressed
with gzip/bzip2; patching src/file.c::file_getUsefulName() 
this way doesn't change anything visible for me:

   if      (!strncmp(mext,".gz",3))  ext = "";
+  else if (!strncmp(mext,".xz",3))  ext = "";
   else if (!strncmp(mext,".bz2",4)) ext = "";

PS: ALT Linux used to ship a 3.6 package with this tmpfile
hardening patch applied, looks like it got lost with 3.7:
http://packages.altlinux.org/en/5.1/srpms/gv/patches/gv-3.6.3-alt-tmpdir.patch
http://packages.altlinux.org/en/5.1/srpms/gv/patches/gv-3.6.3-alt-tmpdir.patch/download
-- maybe someone else will find it useful too...

PPS: git.savannah.gnu.org seems unavailable now (http/git/ssh).

-- 
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