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seems like configure thinks we are crosscompiling unless we set CC when
--build and --host are specified.

this is to catch bugs in abuild itself early

it wrongly scanned /lib instead of $datadir/lib, causing bad things to
happen when scanning provides

its only arm that needs it

instead let apkbuilds use --host and --build

and exit with error if not

This reverts commit 4234a10e.

We will not use config.guess. Instead we will use --build and --host
everywhere.

instead, provide 'update_config_sub' and let aports that needs replace
config.sub call it.

we want be able to run build and rootpkg separately. so you can stop
in the process, fix things, and then continue with 'abuild rootpkg' to
generate the package manually.

If some package fails, then stop processing the rest. This is so we
don't risk test build the rest for the packages against wrong lib.

For example, if 'abump libfoo-2.0 foo-2.0' fails on libfoo, we don't
want testbuild foo-2.0, which might end with success against libfoo-1.

We also echo the list of packages that was not bumped, so its easy to
copy/paste next run.

Use a global var for last_commit so we dont need call git for every
subpackage

For example, to mask out musl, add:
options="!libc_musl"

We need set it in global scope as we need it even if we have not called
sanitycheck

we better fix the affected apkbuilds

It appears that when the subshell has a ||, the 'set -e' within
subshell gets invalidated.

This will work as expected:

 ( set -e; false; echo "should not get here" )

While this will not work as expected:

 ( set -e; false; echo "should not get here" ) || false

We resolve it by using $? to detect the status of subshell. We also let
the exitcode indicate how many packages that failed.

While here we also refactor it so most of the loop happens within the
subshell. This lets us set (or increase) rc variable once, and it
reduces number of forks which gives slightly better performance.

We actually want be able to re-run abump without needing reset the
pkgver in case we had to fix things.

This reverts commit 8198ded8.

Conflicts:
	abump.in

Otherwise abuild-sign will end with error

This permits introducing branch-specific modifications to abuild.conf settings.
Any settings there override /etc/abuild.conf and $HOME/.abuild/abuild.conf.