Deprecate SSL_library_init.

It just calls CRYPTO_library_init and doesn't do anything else. If
anything, I'd like to make CRYPTO_library_init completely go away too.
We have CRYPTO_once now, so I think it's safe to assume that, if ssl/
ever grows initialization needs beyond that of crypto/, we can hide it
behind a CRYPTO_once and not burden callers.

Change-Id: I63dc362e0e9e98deec5516f4620d1672151a91b6
Reviewed-on: https://boringssl-review.googlesource.com/6311
Reviewed-by: Adam Langley <alangley@gmail.com>

ssl/ssl_test.cc

diff --git a/ssl/ssl_test.cc b/ssl/ssl_test.cc
index 810d3fa..875fac8 100644
--- a/ssl/ssl_test.cc
+++ b/ssl/ssl_test.cc
@@ -20,6 +20,7 @@
 
 #include <openssl/base64.h>
 #include <openssl/bio.h>
+#include <openssl/crypto.h>
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
@@ -819,7 +820,7 @@
 }
 
 int main() {
-  SSL_library_init();
+  CRYPTO_library_init();
 
   if (!TestCipherRules() ||
       !TestSSL_SESSIONEncoding(kOpenSSLSession) ||