shim 13:

- OpenSSL reverted to 1.0.2k to make the cert chaining of existing
  deployments stay working
- Better PCR usage for TPM
- TPM documentation in README.tpm
- More configurable build via make variables:
  ENABLE_SHIM_CERT
  ENABLE_SHIM_HASH
  ENABLE_SBSIGN
  LIBDIR
  EFIDIR
  VENDOR_CERT_FILE
  VENDOR_DB_FILE
- Better MoK documentation in MokVars.txt
- Better debuginfo generation
- Lots of minor bug fixes.
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