setup: do not use -c with msgfmt on Solaris (issue1489)

setup.py

@@ -139,9 +139,12 b' class build_mo(build):'
             pofile = join(podir, po)
             modir = join('locale', po[:-3], 'LC_MESSAGES')
             mofile = join(modir, 'hg.mo')
+            cmd = ['msgfmt', '-v', '-o', mofile, pofile]
+            if sys.platform != 'sunos5':
+                # msgfmt on Solaris does not know about -c
+                cmd.append('-c')
             self.mkpath(modir)
-            self.make_file([pofile], mofile, spawn,
-                           (['msgfmt', '-v', '-c', '-o', mofile, pofile],))
+            self.make_file([pofile], mofile, spawn, (cmd,))
             self.distribution.data_files.append((join('mercurial', modir),
                                                  [mofile]))