PHP 7.4 support

[remicollet]

Build fails for now

At least with new php_pcre_match_impl prototype

[lijiefeng-lee]

php74 不行hp_pcre_match_impl(cache, subject, strlen(subject), result, subpats, 0, 0, 0, 0 TSRMLS_CC);
^~~~~~~
In file included from /usr/src/php/ext/molten/molten_intercept.h:38,
from /usr/src/php/ext/molten/molten_intercept.c:16:
/usr/local/include/php/ext/pcre/php_pcre.h:45:70: note: expected 'zend_string *' {aka 'struct _zend_string *'} but argument is of type 'char *'
PHPAPI void php_pcre_match_impl(pcre_cache_entry *pce, zend_string *subject_str, zval *return_value,
~~~~~~~~~~~~~^~~~~~~~~~~
/usr/src/php/ext/molten/molten_intercept.c:338:45: warning: passing argument 3 of 'php_pcre_match_impl' makes pointer from integer without a cast [-Wint-conversion]
php_pcre_match_impl(cache, subject, strlen(subject), result, subpats, 0, 0, 0, 0 TSRMLS_CC);
^~~~~~~~~~~~~~~
In file included from /usr/src/php/ext/molten/molten_intercept.h:38,
from /usr/src/php/ext/molten/molten_intercept.c:16:
/usr/local/include/php/ext/pcre/php_pcre.h:45:89: note: expected 'zval *' {aka 'struct _zval_struct *'} but argument is of type 'size_t' {aka 'long unsigned int'}
PHPAPI void php_pcre_match_impl(pcre_cache_entry *pce, zend_string *subject_str, zval *return_value,
~~~~~~^~~~~~~~~~~~
/usr/src/php/ext/molten/molten_intercept.c:338:70: warning: passing argument 5 of 'php_pcre_match_impl' makes integer from pointer without a cast [-Wint-conversion]
php_pcre_match_impl(cache, subject, strlen(subject), result, subpats, 0, 0, 0, 0 TSRMLS_CC);
^~~~~~~
In file included from /usr/src/php/ext/molten/molten_intercept.h:38,
from /usr/src/php/ext/molten/molten_intercept.c:16:
/usr/local/include/php/ext/pcre/php_pcre.h:46:21: note: expected 'int' but argument is of type 'zval *' {aka 'struct _zval_struct *'}
zval *subpats, int global, int use_flags, zend_long flags, zend_off_t start_offset);
~~~~^~~~~~
/usr/src/php/ext/molten/molten_intercept.c:338:9: error: too many arguments to function 'php_pcre_match_impl'
php_pcre_match_impl(cache, subject, strlen(subject), result, subpats, 0, 0, 0, 0 TSRMLS_CC);