libsubprocess/test: Remove config.h in header

Problem: Generally speaking, config.h should not be included
in header files, but it was included in one test header file.

Remove include of config.h from the test header file.

Author: chu11

src/common/libsubprocess/test/rcmdsrv.h

@@ -8,10 +8,6 @@
  * SPDX-License-Identifier: LGPL-3.0
 \************************************************************/
 
-#if HAVE_CONFIG_H
-#include "config.h"
-#endif
-
 #ifndef _SUBPROCESS_TEST_RCMDSRV_H
 #define _SUBPROCESS_TEST_RCMDSRV_H