Disable --with-valgrind by default (#10934)

Same reasoning as GH-10876

Author: iluuu1994

configure.ac

@@ -781,7 +781,7 @@ PHP_ARG_WITH([valgrind],
   [whether to enable valgrind support],
   [AS_HELP_STRING([--with-valgrind],
     [Enable valgrind support])],
-  [yes],
+  [no],
   [no])
 
 if test "$PHP_VALGRIND" != "no"; then