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This fixes issue with `abuild cleanpkg all`, which would fail to set
SOURCE_DATE_EPOC for reproducible builds.

this is required when we package stuff with compatibility to glibc like
libc6-compat

fixes #5421

fixes #9999

prefix each test output so its easier to see what is tested

ref #9999

fixes #10004

This has multiple advantages:
* It's tool agnostic (e.g. if we were to drop the ninja symlink
  for samu, we wouldn't have to change anything here)
* It allows for more fine grained control, e.g. in meson test,
  where we can increase timeouts and print the test log to stdout,
  something which we can't control when invoking it via ninja.
* We can pass --no-rebuild to test and install, so ninja doesn't
  have to check if anything has to be rebuild against in the test
  and install phase, when we built everything in the build phase
  already

This is similiar to dd24cdf8, but
for meson.

so we have buffer space for the ".part" suffix.

fix return value for usage text

fix digest to be unsigned char buffer

Try all patches and return of list of patches that failed rather than
exit on first failed patch.

But let env var CFLAG override

Without these we don't have any optimizations by default in D applications

Store exit code in the variable 'e', then return it, if there are no
errors then it will return 0 as that is the default value, otherwise it
will return 1 and error out as previously

use whitespace instead of tab where appropriate

Root cause of a malloc() failure when processing large files (>2GB) in an archive.

That ensures that we always use the versions specified in the Cargo.lock
file, which is required for reproducible builds