audio/umurmur: Update version 0.2.17=>0.2.20

• Adopt port as the mails from the MAINTAINER is bouncing. In case the MAINTAINER returns please send me a mail for adoption [1]
• This port supports building with mbedtls so conditionally build with mbedtls when the OSVERSION is ge 1400089. This version will need to be updated based in the OSVERSION of OpenSSL 3 merge in the base.

Changelog: https://github.com/umurmur/umurmur/releases/tag/0.2.20
Reported by: emaste [1]
Approved by: portmgr (blanket)