Compilation error fix

[azlymoon]

At the moment, when attempting to compile KTemplate, several errors occur:

1. Insufficient arguments when calling the array_splice function.
2. Error in using the constant KPHP_COMPILER_VERSION.

The PR addresses the locations where the errors occurred. Now KTemplate compiles and works without issues.

[quasilyte]

Could you describe how you tried to run it?
It's supposed to be used along with kphp stubs library that should define KPHP_VERSION constant:
https://github.com/VKCOM/kphp-polyfills/blob/fd09f5532ffa3770a9f458fefe8cdb0729bc1f92/kphp_polyfills.php#L29

The array_splice has default arguments that should be supported by both PHP and KPHP.
https://www.php.net/manual/en/function.array-splice.php

[azlymoon]

The error with the constant KPHP_COMPILER_VERSION occurs because kphp now works with modulite.
The error message looks like this: [modulite] restricted to use KPHP_COMPILER_VERSION, it does not belong to package #quasilyte/ktemplate

The default value for the parameter length in array_splice was introduced only in PHP8, which is not yet supported by kphp.