Try to improve chances of successful build - including, but not
limited to disabling compiler-optimizations.

Proper fixing seems inherently impossible -- even with -O0 valgrind
flags hundreds of unitilized memory accesses during self-check.

Tested with gcc8 and the base cc (clang) -- remove the GCC-requirement.

Add some patches from Debian.

While here simplify the extract-target a little and remove the BROKEN*
lines to attempt building on other platforms again...

Bump port-revision.

PR: 232936