openssl: fix thread-safety bugs in error-handling
ERR_error_string with NULL parameter is not thread-safe. The library writes the string into some static buffer. Two threads doing this at once may clobber each other and run into problems. Switch to ERR_error_string_n which avoids this problem and is explicitly bounds-checked. Also clean up some remnants of OpenSSL 0.9.5 around here. A number of comments (fixed buffer size, explaining that ERR_error_string_n was added in a particular version) date to when ossl_strerror tried to support pre-ERR_error_string_n OpenSSLs. Closes #1424
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