Require v8 3.24.6 or higher

Just tested it, v8js builds correctly with 3.24.6 and fails to build
against 3.24.5 due to `RequestInterrupt' being undefined.

Syncing the check in config.m4 (used to test 3.21.12 or newer) against
README.md file (which stated 3.24.10 or newer).

README.md

@@ -14,7 +14,7 @@ Minimum requirements
 	V8 is Google's open source Javascript engine.
 	V8 is written in C++ and is used in Google Chrome, the open source browser from Google.
 	V8 implements ECMAScript as specified in ECMA-262, 5th edition.
-    This extension makes use of V8 isolates to ensure separation between multiple V8Js instances and uses the new isolate-based mechanism to throw exceptions, hence the need for 3.24.10 or above.
+    This extension makes use of V8 isolates to ensure separation between multiple V8Js instances and uses the new isolate-based mechanism to throw exceptions, hence the need for 3.24.6 or above.
 
     For a detailed overview of which V8 version V8Js can be successfully built against, see the
     [Jenkins V8Js build matrix](https://jenkins.brokenpipe.de/job/docker-v8js-matrix/).

config.m4

@@ -91,8 +91,8 @@ int main ()
     set $ac_cv_v8_version
     IFS=$ac_IFS
     V8_API_VERSION=`expr [$]1 \* 1000000 + [$]2 \* 1000 + [$]3`
-    if test "$V8_API_VERSION" -lt 3021012 ; then
-       AC_MSG_ERROR([libv8 must be version 3.21.12 or greater])
+    if test "$V8_API_VERSION" -lt 3024006 ; then
+       AC_MSG_ERROR([libv8 must be version 3.24.6 or greater])
     fi
     AC_DEFINE_UNQUOTED([PHP_V8_API_VERSION], $V8_API_VERSION, [ ])
     AC_DEFINE_UNQUOTED([PHP_V8_VERSION], "$ac_cv_v8_version", [ ])