Remove set_memory_limit_002 test

The test is unfortunately unstable as it somehow depends on CPU speed.
v8 seems to precompute the result even so it hasn't reached the for
loop consuming the memory.

This can be proved easily by adding a sleep(1) call at the start of the
prolongTimeLimit function.  Then the memory limit is always tripped
even so v8 didn't have to do much until there

tests/set_memory_limit_002.phpt

@@ -1,46 +0,0 @@
---TEST--
-Test V8::setMemoryLimit() : Memory limit can be changed
---SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
---FILE--
-<?php
-
-$JS = <<< EOT
-var jsfunc = function() {
-    PHP.incrMemoryLimit();
-    var text = "abcdefghijklmnopqrstuvwyxz0123456789";
-    var memory = "";
-    for (var i = 0; i < 100; ++i) {
-	for (var j = 0; j < 10000; ++j) {
-            memory += text;
-	}
-	sleep(0);
-    }
-};
-jsfunc;
-EOT;
-
-$v8 = new V8Js();
-$v8->setMemoryLimit(1000000);
-
-$v8->incrMemoryLimit = function() use ($v8) {
-    $v8->setMemoryLimit(10000000);
-};
-
-$func = $v8->executeString($JS);
-var_dump($func);
-
-try {
-    $func();
-} catch (V8JsMemoryLimitException $e) {
-    print get_class($e); print PHP_EOL;
-    print $e->getMessage(); print PHP_EOL;
-}
-?>
-===EOF===
---EXPECTF--
-object(V8Function)#%d (0) {
-}
-V8JsMemoryLimitException
-Script memory limit of 10000000 bytes exceeded
-===EOF===