fix for php 8.2: declare used properties

[remicollet]

No description provided.

[andypost]

It needs rebase but it fixes all failed tests, before patch

FAILED TEST SUMMARY
---------------------------------------------------------------------
OauthProvider Creation [tests/oauthprovider_001.phpt]
OauthProvider isRequestTokenEndpoint [tests/oauthprovider_002.phpt]
OauthProvider consumerHandler/callConsumerHandler [tests/oauthprovider_003.phpt]
OauthProvider tokenHandler/callTokenHandler [tests/oauthprovider_004.phpt]
OauthProvider timestampNonceHandler/callTimestampNonceHandler [tests/oauthprovider_005.phpt]
OauthProvider checkOauthRequest [tests/oauthprovider_006.phpt]
OauthProvider checkOauthRequest [tests/oauthprovider_007.phpt]
OauthProvider setParam addref segfault [tests/oauthprovider_008.phpt]

meantime while building there's warning

/mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/oauth.c: In function 'make_req_streams':
/mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/oauth.c:918:61: warning: the comparison will always evaluate as 'true' for the address of 'last_location_header' will never be NULL [-Waddress]
  918 |                         if (HTTP_IS_REDIRECT(response_code) && soo->last_location_header) {
      |                                                             ^~
In file included from /mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/oauth.c:12:
/mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/php_oauth.h:221:14: note: 'last_location_header' declared here
  221 |         char last_location_header[OAUTH_MAX_HEADER_LEN];
      |              ^~~~~~~~~~~~~~~~~~~~
/mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/oauth.c: In function 'make_req_curl':
/mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/oauth.c:1234:61: warning: the comparison will always evaluate as 'true' for the address of 'last_location_header' will never be NULL [-Waddress]
 1234 |                         if (HTTP_IS_REDIRECT(response_code) && soo->last_location_header) {
      |                                                             ^~
/mnt/testing/php82-pecl-oauth/src/pecl-web_services-oauth-2.0.8/php_oauth.h:221:14: note: 'last_location_header' declared here
  221 |         char last_location_header[OAUTH_MAX_HEADER_LEN];
      |              ^~~~~~~~~~~~~~~~~~~~