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The force flag used to skip the following functions, without any
documentation in the help (-h) output:

  * verify (checksum verification)
  * initdcheck (check if the init scripts are openrc scripts)
  * check_arch (check if the target architecture is in "arch=")
  * check_libc (check if the target libc is masked in the options)

This was counter-intuitive and could even be dangerous (when one relies
on the checksum verification to prevent man-in-the-middle attacks, but
always uses the -f flag).

With this commit, it only skips check_arch and check_libc besides the
package up to date check and the help output mentions this.

Since we already check that $install is not in $source is does make
sense to also check that $triggers is not in $source.

provides cannot contain the pkgname or apk will be very unhappy.

this is needed for running some test runners such as kyua under rootbld.

when building a package with abuildd, a copy of the git checkout is cloned to /tmp, which
causes difficulties.

provider_priority is a number which determines what priority a package should be
given when solving a dependency graph using a provides entry instead of a direct
package, in the event of conflicts.

This adds an env option REQUIRE_CHECK to require testsuites to
be run. This does not clutter getopts so it can be safely removed
afterwards when we enforce tests globally. This will allow our CI
infrastructure to enforce testsuites where possible.

it is slightly shorter

The purpose was to show abuild version in the build logs

Guile uses ELF is internal object format, and creates them as
"no machine" and "standlone" OSABI. Scanelf supports printing
OSABI, so use that to filter these out.
See: https://github.com/alpinelinux/aports/pull/1714

This also removes unneccessary 'sed' from the pipeline as it's
simple to read each field outputted by scanelf.

As discussed in alpinelinux/aports#1438
saveas- was removed from abuild-fetch.c with https://github.com/alpinelinux/abuild/pull/20 but abuild.in slipped.
Also fixes a wget -s instance that's not supported by recent busybox (-s was changed for --spider).
/cc @kaniini

After the first dep is printed, `shift` is called to avoid the special
case where the first dep cannot have a comma prepended.  However,
if there are no deps for a package (seen early on in the aports main
repo in acf-jquery), $# is 0.  POSIX specifies that `shift` has two
options when the shift operand (1) is greater than $#:

- if non-interactive, it can exit the shell
- if it does not exit the shell, it must return a non-zero exit code

Since we run the shell with -e, the second case folds in to the first.

BusyBox ash does not implement this behaviour, but bash does when called
as /bin/sh or when the `posix` shopt is set.

and respect -q flag

Currently is hard to discover what abuild version was used on a build log.
This lack of information makes it hard to reproduce a buld failure.

This change simply adds the abuild version at all logs.

the set -e made script exit early

This is useful for debugging

The secfixes comment will be parsed and added to alpine-secdb. add
sanitycheck so we catch errors early.

This patch is based on earlier work by Timo Teräs.