Fix the SO_LISTENQLEN check in FPM (#13089)

This now defines the HAVE_LQ_SO_LISTENQ as the fallback check when all
previous have failed in case of FPM LQ. This seemed to be a typo in the
build system.

Author: petk

sapi/fpm/config.m4

@@ -343,8 +343,8 @@ AC_DEFUN([AC_FPM_LQ],
       AC_MSG_RESULT([no])
     ])
 
-    if test "$have_lq" = "tcp_info"; then
-      AC_DEFINE([HAVE_LQ_SO_LISTENQ], 1, [do we have SO_LISTENQxxx?])
+    if test "$have_lq" = "so_listenq"; then
+      AC_DEFINE([HAVE_LQ_SO_LISTENQ], 1, [do we have SO_LISTENQ?])
     fi
   fi
 ])

sapi/fpm/fpm/fpm_sockets.c

@@ -609,9 +609,8 @@ int fpm_socket_get_listening_queue(int sock, unsigned *cur_lq, unsigned *max_lq)
 
 	return 0;
 }
-#endif
 
-#ifdef HAVE_LQ_SO_LISTENQ
+#elif defined(HAVE_LQ_SO_LISTENQ)
 
 int fpm_socket_get_listening_queue(int sock, unsigned *cur_lq, unsigned *max_lq)
 {