The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

* PHP-7.2:
  Guard platform dependent code

* PHP-7.1:
  Guard platform dependent code

Having `int` there is no real profit in the size or speed, while unsigned
improves security and overall integration. ZPP supplied strings can
be then accepted directly and structs can be still handled with smaller
unsigned types for size reasons, which is safe. Yet some related places
are to go.

basic move tsrm_realpath_r to size_t

fix conditions and sync with affected places

touch ocurrences of php_sys_readlink usage

follow up on phar path handling

remove duplicated check

move zend_resolve_path and related pieces to size_t

touch yet resolve path related places

remove cast

missing pieces

missing piece

yet cleanups for php_sys_readlink for ssize_t

fix wrong return