fix build with 8.1.0alpha2

[remicollet]

error_filename changed from const char * to zend_string *

/dev/shm/BUILD/php81-php-pecl-memprof-3.0.1/NTS/memprof.c: In function 'zm_startup_memprof':
/dev/shm/BUILD/php81-php-pecl-memprof-3.0.1/NTS/memprof.c:1136:20: warning: assignment to 'void (*)(int,  const char *, const uint32_t,  zend_string *)' {aka 'void (*)(int,  const char *, const unsigned int,  struct _zend_string *)'} from incompatible pointer type 'void (*)(int,  zend_string *, const uint32_t,  zend_string *)' {aka 'void (*)(int,  struct _zend_string *, const unsigned int,  struct _zend_string *)'} [-Wincompatible-pointer-types]
 1136 |  old_zend_error_cb = zend_error_cb;
      |                    ^
/dev/shm/BUILD/php81-php-pecl-memprof-3.0.1/NTS/memprof.c:1137:16: warning: assignment to 'void (*)(int,  zend_string *, const uint32_t,  zend_string *)' {aka 'void (*)(int,  struct _zend_string *, const unsigned int,  struct _zend_string *)'} from incompatible pointer type 'void (*)(int,  const char *, const uint32_t,  zend_string *)' {aka 'void (*)(int,  const char *, const unsigned int,  struct _zend_string *)'} [-Wincompatible-pointer-types]
 1137 |  zend_error_cb = memprof_zend_error_cb;
      |                ^

I also change all ZEND_MODULE_API_NO to PHP_VERSION_ID which seems more legible

[arnaud-lb]

Thanks @remicollet

I will add 8.1 to the checks