Get rid of compilation warning messages

src/MacVim/AuthorizedShellCommand.m

@@ -71,7 +71,7 @@
         arguments[i] = NULL;
 
         err = AuthorizationExecuteWithPrivileges (authorizationRef, toolPath,
-                kAuthorizationFlagDefaults, arguments, &ioPipe);
+                kAuthorizationFlagDefaults, (char*const*)arguments, &ioPipe);
         if (err != errAuthorizationSuccess)
             goto cleanup;
 

src/MacVim/MMAppController.m

@@ -1152,7 +1152,7 @@ executeInLoginShell(NSString *path, NSArray *args)
 
     // Get the C string representation of the shell path before the fork since
     // we must not call Foundation functions after a fork.
-    char *shellPath = [shell fileSystemRepresentation];
+    const char *shellPath = [shell fileSystemRepresentation];
 
     // Fork and execute the process.
     int ds[2];