Add openssl version -a and -p flag support

[geedo0]

Description of changes:

For compatibility, we should implement these CLI flags to prevent certain test scripts from erroring out.

Add -a (all) and -p (platform) boolean flags to the version subcommand:

• No flags: print version line only (preserves existing behavior)
• -a: print version, built on, platform, compiler, OPENSSLDIR
• -p: print platform line only

Call-outs:

This doesn't actually print anything useful, but it does call the OpenSSL APIs and prints the stub strings that we had in place. If I had to hazard a guess this was either an intentional attempt to avoid leaking implementation details or they were lazy (Occam's razor suggests the latter).

Testing:

How is this change tested (unit tests, fuzz tests, etc.)? Are there any testing steps to be verified by the reviewer?

# Sample outputs
➜  aws-lc git:(version-a) ✗ ./build/tool-openssl/openssl version -p
platform: n/a
➜  aws-lc git:(version-a) ✗ ./build/tool-openssl/openssl version -a
OpenSSL 1.1.1 (compatible; AWS-LC 1.69.0)
built on: n/a
platform: n/a
compiler: n/a
OPENSSLDIR: n/a

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.20%. Comparing base (c15e28d) to head (4b0f863).

Files with missing lines	Patch %	Lines
tool-openssl/version.cc	0.00%	19 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3092   +/-   ##
=======================================
  Coverage   78.20%   78.20%           
=======================================
  Files         689      689           
  Lines      122048   122066   +18     
  Branches    17030    17032    +2     
=======================================
+ Hits        95446    95461   +15     
- Misses      25698    25702    +4     
+ Partials      904      903    -1     

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[justsmth]

Out of scope, but this might be a rare PR for which we have motivation to provide a proper implementation of OpenSSL_version

const char *OpenSSL_version(int which) {
  switch (which) {
    case OPENSSL_VERSION:
      return AWSLC_VERSION_STRING;
    case OPENSSL_CFLAGS:
      return "compiler: n/a";
    case OPENSSL_BUILT_ON:
      return "built on: n/a";
    case OPENSSL_PLATFORM:
      return "platform: n/a";
    case OPENSSL_DIR:
      return "OPENSSLDIR: n/a";
    default:
      return "not available";
  }
}

[geedo0]

Out of scope, but this might be a rare PR for which we have motivation to provide a proper implementation of OpenSSL_version

We still have no motivation here beyond aesthetics. The compatibility issue I'm addressing merely needs these commands to exit without error. Implementing these would require plumbing down all the values from CMake into the source. I looked into the original BoringSSL commit that added these stubs and they similarly didn't really care to do much beyond just preventing things from failing.