Fix spurious failures of php-fuzz-mbstring

php-fuzz-mbstring also tests text encoding validation functions

In 6fc8d014df, pakutoma added specialized validation functions for
ISO-2022-JP, JIS, UTF-7, and UTF7-IMAP text. In the fut

php-fuzz-mbstring also tests text encoding validation functions

In 6fc8d014df, pakutoma added specialized validation functions for
ISO-2022-JP, JIS, UTF-7, and UTF7-IMAP text. In the future, it is
possible we might add such functions for more legacy text encodings.
Allowing them to be tested by php-fuzz-mbstring may help to catch
bugs, both now and in the future.

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When fuzzing mbstring encoding conversion code, compare output with different intermediate buffer sizes

Currently, php-fuzz-mbstring only confirms that no crashes (including
ASAN violati

When fuzzing mbstring encoding conversion code, compare output with different intermediate buffer sizes

Currently, php-fuzz-mbstring only confirms that no crashes (including
ASAN violations) occur when converting text from one encoding to
another.

Try performing each conversion operation with two different sizes for
the intermediate buffer which is used to pass data from the decoder to
the encoder. If the encoding conversion code is correct, the size of
that intermediate buffer shouldn't matter; we should always get exactly
the same results.

This is a much stricter test, which is more likely to catch bugs.

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php_mb_convert_encoding{,_ex} returns zend_string

That's what all existing callers want anyways. This avoids 2
unnecessary copies of the converted string.

Use fast text conversion filters to implement php_mb_convert_encoding_ex

Add fuzzer for mb_convert_encoding

This uses the php-fuzz-mbstring name, moving the existing fuzzer
to php-fuzz-mbregex.

Add fuzzer for function JIT

This is a basic fuzzer for the function JIT, which looks for
crashes and sanitizer violations only, and does not try to detect
differing behavior yet.

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as 3.0 states "php 5.1.1, 4.1.1, and earlier".
3. In some license comments is "at through the world-wide-web" while most is without "at", so deleted.
4. fixed indentation in some files before |

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Fix mbstring fuzzer

mb_ereg can throw now, so we need a dummy frame and need to
free the exception afterwards.

Further reduce parse depth limit in mbstring fuzzer

Depth limit of 1024 still causes optimize_node stack overflows
when running under asan.

Limit parse depth in mbstring fuzzer

The default depth of 4096 is large enough to cause optimize_node
stack overflows under asan. Reduce to 1024.

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Various improvements to fuzzer SAPIs

Add fuzzer SAPIs to the core