Annotate logcat with current running test (oemcrypto)

Merge from widevine repo of http://go/wvgerrit/14125

This copies code from http://go/wvgerrit/13847 to the oemcrypto unit
tests.  It puts the test name in the log file.

I also commented out some unused function parameters to avoid compiler
warnings.

Change-Id: I3ba259de2f408ec60e90db7f0ea1524d5aa8f8a4

libwvdrmengine/cdm/core/src/privacy_crypto_openssl.cpp

@@ -182,7 +182,7 @@ bool RsaPublicKey::Encrypt(const std::string& clear_message,
 
 // LogOpenSSLError is a callback from OpenSSL which is called with each error
 // in the thread's error queue.
-static int LogOpenSSLError(const char *msg, size_t len, void *ctx) {
+static int LogOpenSSLError(const char *msg, size_t /* len */, void */* ctx */) {
   LOGE("  %s", msg);
   return 1;
 }