www/mongrel2: Update to 1.11.0

Port changes:

• Changed to DISTVERSION
• Updated LIB_DEPENDS
• Changed to GitHub
• GH_TUPLE to unbundle src/mbedtls
• Decoupled build and tests
• Added TEST_xx lines for tests to run separately
• Updated Makefile patches
• Silenced/unsilenced commands

Tests fail on 12: Invalid system call

PR: 226315
Submitted by: Neel Chauhan <neel@neelc.org> (maintainer)
Approved by: tcberner (mentor, implicit)