Undef basename before defining function.

* path.cc (basename): Undefine basename before defining function to
        avoid type collision with prototype in string.h.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/ChangeLog

@@ -1,3 +1,8 @@
+2015-04-22  Corinna Vinschen  <corinna@vinschen.de>
+
+	* path.cc (basename): Undefine basename before defining function to
+	avoid type collision with prototype in string.h.
+
 2015-04-21  Corinna Vinschen  <corinna@vinschen.de>
 
 	* include/libgen.h: Remove in favor of newlib version.

winsup/cygwin/path.cc

@@ -4726,6 +4726,8 @@ out:
   return buf;
 }
 
+#undef basename
+
 /* No need to be reentrant or thread-safe according to SUSv3.
    / and \\ are treated equally.  Leading drive specifiers are
    kept intact as far as it makes sense.  Everything else is