Fix [-Wundef] warning in main folder

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.

A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.

This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.

With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.

Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.

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Remove yearly range from copyright notice

Remove year range from copyright notice

Remove unused Git attributes ident

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

Remove unused Git attributes ident

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.

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Add RtlSecureZeroMemory to explicit_bzero() compile case

just in case one would use the function directly. The use of
ZEND_SECURE_ZERO could be eliminated now, too. Or it can be
kept

Add RtlSecureZeroMemory to explicit_bzero() compile case

just in case one would use the function directly. The use of
ZEND_SECURE_ZERO could be eliminated now, too. Or it can be
kept for BC.

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NetBSD has its own unoptimizable memset version since 2013

checking presence of the function if older versions of NetBSD

Trailing whitespaces

Signed-off-by: Gabriel Caruso <carusogabriel34@gmail.com>

year++

year++

Improve explicit_bzero implementation

Using the weak symbol explicit_bzero_hook does not work if LTO is
enabled. Instead avoid memset optimizations using an asm memory
barrier.

Improve explicit_bzero implementation

Using the weak symbol explicit_bzero_hook does not work if LTO is
enabled. Instead avoid memset optimizations using an asm memory
barrier.

Use a fallback implementation where the memory is zeroed through
volatile.

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sync vim mode lines in main

Update copyright header for new file

import explicit_bzero + strlc* functions update
since 1999 algorithms have changed and register k/w
not necessary anymore.