The output normalization of bless_tests.php only detected absolute Unix
filenames; we extend this for absolute Windows filenames, regardless of
the platform we're running on (tests may have been run on Windows, but
bless_tests.php may be run from WSL or a Linux VM, for instance).

Mostly reindent PHP scripts to spaces.

Many parts are disabled for the PHP-7.4 branch. We only strip
trailing whitespace in C files and reindent .php files to spaces.

Resources used as array keys are generally handled by throwing a
notice and converting the resource to the resource handle. The only
exception is the [$resource => null] syntax, where this was treated
as an illegal offset type instead. However, this also only happened
for VM evaluations, the AST evaluator did handle resources correctly.

Similar to what is done for socket read/write errors.

If a string var_dump contains a wildcard, also make the length a
wildcard.

Instead of patching configuration headers template generated by
the given tools - autoheader, this moves patching these symbols to
the configure step before creating and invoking the config.status
and before the configuration header file is generated from the
patched template.

Closes GH-4374

- Variables php_abs_top_srcdir php_abs_top_builddir are no longer used.
- ZEND_EXT_TYPE is always zend_extension and variable is no longer used.

Closes GH-4378