fix openbsd build of libesl (FSBUILD-256)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@17070 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/esl/fs_cli.c

-#ifndef _XOPEN_SOURCE
+#if !defined(_XOPEN_SOURCE) && !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
 #define _XOPEN_SOURCE 600
 #endif
 

libs/esl/ivrd.c

@@ -66,7 +66,7 @@ static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struc
 	handle.sock = -1;
 	esl_disconnect(&handle);
 	
-	execl(path_buffer, path_buffer, NULL);
+	execl(path_buffer, path_buffer, (char *)NULL);
 	//system(path_buffer);
 	close(client_sock);
 	exit(0);

libs/esl/src/include/esl.h

@@ -116,7 +116,7 @@ typedef enum {
 #define ESL_SEQ_CLEARSCR ESL_SEQ_ESC ESL_SEQ_CLEARSCR_CHAR ESL_SEQ_HOME
 #endif
 
-#if !defined(_XOPEN_SOURCE) && !defined(__FreeBSD__) && !defined(__NetBSD__)
+#if !defined(_XOPEN_SOURCE) && !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
 #define _XOPEN_SOURCE 600
 #endif