get rid of SSL_get_app_data2_idx() which had a race condition when

writing to app_data2_idx, and another inside OpenSSL when calling
SSL_get_ex_new_index().
add SSL_init_app_data2_idx() to provide the same functionality but in
a safe place: called during ssl_init_Module
PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92110 13f79535-47bb-0310-9956-ffa450edef68