removed mch_rmdir macro

src/fileio.c

@@ -5622,7 +5622,7 @@ void vim_deltempdir(void)
       FreeWild(file_count, files);
     }
     path_tail(NameBuff)[-1] = NUL;
-    (void)mch_rmdir(NameBuff);
+    os_rmdir((char *)NameBuff);
 
     vim_free(vim_tempdir);
     vim_tempdir = NULL;

src/os_unix_defs.h

@@ -31,7 +31,6 @@
 #endif
 
 #define vim_mkdir(x, y) os_mkdir((char *)(x), (y))
-#define mch_rmdir(x)    os_rmdir((char *)(x))
 
 /* The number of arguments to a signal handler is configured here. */
 /* It used to be a long list of almost all systems. Any system that doesn't