Disable MPM detection

mod_php is build twice
- as NTS without option
- as ZTS using --enable-maintainer-zts

diff -up ./sapi/apache2handler/config.m4.mpmcheck ./sapi/apache2handler/config.m4
--- ./sapi/apache2handler/config.m4.mpmcheck	2024-07-03 15:56:56.882370597 +0200
+++ ./sapi/apache2handler/config.m4	2024-07-03 15:59:15.967824949 +0200
@@ -110,11 +110,6 @@ if test "$PHP_APXS2" != "no"; then
     ;;
   esac
 
-  AS_IF([$APXS_HTTPD -V 2>/dev/null | grep 'threaded:.*yes' >/dev/null 2>&1], [
-    APACHE_THREADED_MPM=yes
-    PHP_BUILD_THREAD_SAFE
-  ], [APACHE_THREADED_MPM=no])
-
 AC_CONFIG_COMMANDS([apache2handler], [AS_VAR_IF([enable_zts], [yes],,
   [AS_VAR_IF([APACHE_THREADED_MPM], [no],
     [AC_MSG_WARN([