security/create-cert: Update to 2.12

While here add WWW.

Changes since 2.11:

• Try to avoid leaking temp files after switching to mktemp.
• getopt -> getopts
• Cleanup key if cert creation fails.
• Update to autoconf 2.72.
• Prefer "openssl rehash" (newer openssl) to c_rehash (sometimes missing) using a patch from Michael Proto.
• Minor consession to ubuntu (where /bin/sh is dash).

PR: 292063
Reported by: Michael Proto
Obtained from: Michael Proto