Add build instructions to Wiki for OpenSSL

[tanzislam]

OpenSSL used to support C++Builder long ago before modernizing their build system, but reverting that logic no longer works. Also unclear whether/how OpenSSL supports building with Oracle Developer Studio.

[tanzislam]

Still in progress for C++Builder. Currently managing to make -N the default target with a static-linked release configuration. Remaining:

• [x] Export environment variables to test-runner Perl script from the makefile. C++Builder's make.exe doesn't use cmd.exe at all, so this becomes difficult.
• [x] Debug builds.
• [x] Shared-library (DLL) builds
• Extra Configure options to test:
  • [ ] enable-buildtest-c++
  • [ ] enable-crypto-mdebug
  • [ ] enable-ec_nistp_64_gcc_128 (perhaps)
  • [ ] enable-egd
  • [ ] enable-external-tests
  • [ ] enable-fuzz-libfuzzer
  • [ ] enable-fuzz-afl
  • [ ] enable-sctp
  • [ ] enable-ssl-trace
  • [ ] enable-threads
  • [ ] enable-trace
  • [ ] enable-unit-test
  • [ ] enable-weak-ssl-ciphers
  • [ ] zlib
  • [ ] zlib-dynamic
  • [ ] 386
  • [ ] enable-md2
  • [ ] enable-rc5

[tanzislam]

Wiki populated, along with some preprocessor tweaks. Experimentation on OpenSSL build options will continue in the background.