- More common filename accross the PHP repository
- Additionally, this patch replaces some legacy form feed (FF or ^L)
  characters (for printers) to LF (\n) newline character.

The `<assert.h>` header file is part of the standard C89 headers [1] and
on older systems there needed to be also a manual check if header is
present.

Since PHP requires at least C89 manual check and the `HAVE_ASSERT_H`
symbol defined by Autoconf in configure.ac can be both removed [2].

This patch also removes unused <assert.h> includes where c files don't
use the `assert()` macro.

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4

* PHP-5.6:
  use zend_error instead of zend_error_noreturn

(cherry picked from commit 40e7baab3c90001beee4c8f0ed0ef79ad18ee0d6)