[monitoring-plugins] Remove unused FPING6 variable

[Lorenz Kästle]

 Module: monitoring-plugins
 Branch: master
 Commit: 1187374e745af310a2e346ab1df5250d07c65a69
 Author: Lorenz Kästle <lorenz.kaes...@netways.de>
   Date: Wed Jun 11 13:11:04 2025 +0200
    URL: 
https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=1187374e

Remove unused FPING6 variable

---

 configure.ac | 1 -
 1 file changed, 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index bd3de196..ae704361 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1519,7 +1519,6 @@ then
 fi
 
 AC_PATH_PROG(PATH_TO_FPING,fping)
-AC_PATH_PROG(PATH_TO_FPING6,fping6)
 
 AC_ARG_WITH(fping_command,
             ACX_HELP_STRING([--with-fping-command=PATH],