sendmail.h is not only included by sendmail.c, but also by
php_win32_globals.h, because that header uses some of the defined
macros.  However, the forward declarations of the static functions are
not needed anywhere else than in sendmail.c, and Clang warns about the
unused functions elsewhere (`-Wunused-function`).  Thus we move the
forward declarations to sendmail.c.

* PHP-8.3:
  Fix GH-17654: Multiple classes using same trait causes function JIT crash

* PHP-8.4:
  Fix GH-17654: Multiple classes using same trait causes function JIT crash

When a guard check is created for a variable to check if it's a packed array,
it is possible that there was no prior type check for that variable.
This happens in the global scope for example when the variable aliases.
In the test, this causes a dereference of address 8 because the integer
element in `$a` is interpreted as an array address.

This patch adds a check to see if the guard is handled.
If we were not able to determine or guard the type then we also cannot know the array is packed.

Closes GH-17584.

* PHP-8.3:
  Fix GH-17577: JIT packed type guard crash

* PHP-8.4:
  Fix GH-17577: JIT packed type guard crash

Since `pdo_odbc_ucs22utf8()` doesn't actually use the `stmt`, we drop
this parameter as well.

These warnings are about conversion from `size_t` to a smaller type[1],
and in this case because `gdIOCtx` works with `int` lengths.  Two of
these warnings are harmless, and we resolve them by using `size_t` in
the first place, and adding a cast (plus an assertion), respectively.

The others actually hint at potential issues when reading image data
with more than `INT_MAX` bytes; we catch that upfront, and throw a
`ValueError` and a warning, respectively.

[1] <https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-3-c4267>

This was asked to be checked in #17472 (comment)

There are 2 issues:
1) The UB in the if can overflow, and can be fixed by using zend_ulong
   for the sum/sub.
2) fast_long_sub_function() has a problem when result aliases.
   This is fixed in the same way as fast_long_add_function() works.

Closes GH-17666.

* PHP-8.3:
  Fix fallback paths in fast_long_{add,sub}_function

* PHP-8.4:
  Fix fallback paths in fast_long_{add,sub}_function

This saves 8 bytes

* PHP-8.1:
  [skip ci] Another flaky phar macOS test

* PHP-8.2:
  [skip ci] Another flaky phar macOS test

* PHP-8.3:
  [skip ci] Another flaky phar macOS test

* PHP-8.4:
  [skip ci] Another flaky phar macOS test

Conversion of floating point to integer values is undefined if the
integral part of the float value cannot be represented by the integer
type.  We need to cater to that explicitly (in a manner similar to
`zend_dval_to_lval_cap()`).

Closes GH-17689.

* PHP-8.3:
  Fix GH-17503: Undefined float conversion in mb_convert_variables

* PHP-8.4:
  Fix GH-17503: Undefined float conversion in mb_convert_variables