Do not check for ERR_remove_thread_state() (do not link ssl into every library) This reverts commit c4e9d9bd662de7f575f2172c160795d452ebe709 ("sample/https-client: check for ERR_remove_thread_state() existence"). Calling AC_SEARCH_LIBS() modifies LIBS - -lcrypto incorrectly ends up in LIBS, and thus linked to by libevent_core.so. Checking for ERR_remove_thread_state should no longer be needed because it was introduced in openssl 1.0.0, and the previous line 0.9.8 had support discontinued at the end of 2015. Fixes: #473