missing access under kfreebsd
gant: don't use devname for variable

it's problematic under freebsd

/«PKGBUILDDIR»/src/gant/gant.c:110:6: error: 'devname' redeclared as different kind of symbol
 char devname[256];
      ^
In file included from /usr/include/x86_64-kfreebsd-gnu/sys/stat.h:105:0,
                 from /«PKGBUILDDIR»/src/gant/gant.c:11:
/usr/include/x86_64-kfreebsd-gnu/bits/stat.h:209:14: note: previous declaration of 'devname' was here
 extern char *devname(__dev_t dev, __mode_t type) __THROW;
              ^
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