ext/gd: report $size with the argument number of the function called

php_imagettftext_common() serves the bbox functions, where $size is
argument #1, and the drawing ones, where it is #2, but its two size
checks hardcode 2. imageftbbox(NAN, ...) therefore blamed $angle.

Also fix the upper bound itself: (double)LONG_MAX rounds up to 2^63, so
(double)LONG_MAX / 64 is 2^57 and the check let 2^57 through, whose
product with 64 is LONG_MAX + 1. The bound is now exclusive, and the
reported values use integer division, which gives the largest size that
is actually representable. The lower bound stays inclusive:
(double)LONG_MIN / 64 is exactly -2^57 and its product with 64 is
LONG_MIN.

Co-authored-by: NickSdot <32384907+NickSdot@users.noreply.github.com>

Close GH-23541

Author: lacatoire

ext/gd/gd.c

@@ -3422,14 +3422,16 @@ static void php_imagettftext_common(INTERNAL_FUNCTION_PARAMETERS, int mode)
 		im = php_gd_libgdimageptr_from_zval_p(IM);
 	}