Preferably include from build dir (#13516)

* Include from build dir first

This fixes out of tree builds by ensuring that configure artifacts are included
from the build dir.

Preferably include from build dir (#13516)

* Include from build dir first

This fixes out of tree builds by ensuring that configure artifacts are included
from the build dir.

Before, out of tree builds would preferably include files from the src dir, as
the include path was defined as follows (ignoring includes from ext/ and sapi/) :

-I$(top_builddir)/main
-I$(top_srcdir)
-I$(top_builddir)/TSRM
-I$(top_builddir)/Zend
-I$(top_srcdir)/main
-I$(top_srcdir)/Zend
-I$(top_srcdir)/TSRM
-I$(top_builddir)/

As a result, an out of tree build would include configure artifacts such as
`main/php_config.h` from the src dir.

After this change, the include path is defined as follows:

-I$(top_builddir)/main
-I$(top_builddir)
-I$(top_srcdir)/main
-I$(top_srcdir)
-I$(top_builddir)/TSRM
-I$(top_builddir)/Zend
-I$(top_srcdir)/Zend
-I$(top_srcdir)/TSRM

* Fix extension include path for out of tree builds

* Include config.h with the brackets form

`#include "config.h"` searches in the directory containing the including-file
before any other include path. This can include the wrong config.h when building
out of tree and a config.h exists in the source tree.

Using `#include <config.h>` uses exclusively the include path, and gives
priority to the build dir.

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Be specific for the namespace of the id attribute (#14060)

Improve performance of text node allocation by marking the text node construction as always inline

Get rid of error gotos in HTML5 parse conversion

Fix potential NULL pointer argument to memcpy (#13859)

This is only possible when the length is 0, but memcpy doesn't like NULL
pointers, as UBSAN trips over it.

Use BAD_CAST consistently

[RFC] Add a way to opt-in ext/dom spec compliance (#13031)

RFC: https://wiki.php.net/rfc/opt_in_dom_spec_compliance

Give anonymous dom structs a name (#13135)

Optimizations for HTML 5 loading (#12896)

* Fix inverted NULL and add dictionary

* Avoid useless error processing if no reporting is set

* Avoid double work while processin

Optimizations for HTML 5 loading (#12896)

* Fix inverted NULL and add dictionary

* Avoid useless error processing if no reporting is set

* Avoid double work while processing attributes and use fast text instantiation

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[RFC] DOM HTML5 parsing and serialization support (#12111)