Add a simple test as upstream doesn't provide a test suite.

This commit updates $license variable in all APKBUILDs to comply with
short names specified by SPDX version 3.0 [1] where possible. It was
done using find-and-replace method on substrings inside $license
variables.

Only license names were updated, not "expressions" specifying relation
between the licenses (e.g. "X and Y", "X or Y", "X and (Y or Z)") or
exceptions (e.g. "X with exceptions").

Many licenses have a version or multiple variants, e.g. MPL-2.0,
BSD-2-Clause, BSD-3-Clause. However, $license in many aports do not
contain license version or variant. Since there's no way how to infer
this information just from abuild, it were left without the variant
suffix or version, i.e. non SPDX compliant.

GNU licenses (AGPL, GFDL, GPL, LGPL) are especially complicated. They
exist in two variants: -only (formerly e.g. GPL-2.0) and -or-later
(formerly e.g. GPL-2.0+). We did not systematically noted distinguish
between these variants, so GPL-2.0, GPL2, GPLv2 etc. may mean
GPL-2.0-only or GPL-2.0-or-later. Thus GNU licenses without "+" (e.g.
GPL2+) were left without the variant suffix, i.e. non SPDX compliant.

Note: This commit just fixes format of the license names, no
verification has been done if the specified license information is
actually correct!

[1]: https://spdx.org/licenses/

qperf fails to build on both x86-64 and ppc64le due to lack of
dependency.

qperf depends on /usr/share/perl5/core_perl/pods/perldiag.pod file, and if it
does not exist (as on a clean env), it shows:

  couldn't find diagnostic data in /usr/share/perl5/core_perl/pods/perldiag.pod /usr/local/lib/perl5/site_perl /usr/local/share/perl5/site_perl /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5/core_perl /usr/share/perl5/core_perl . ./mkhelp at /usr/share/perl5/core_perl/diagnostics.pm line 259, <POD_DIAG> line 704.
  Compilation failed in require at ./mkhelp line 5.
  BEGIN failed--compilation aborted at ./mkhelp line 5.
  make[1]: *** [Makefile:475: help.c] Error 2
  make[1]: *** Waiting for unfinished jobs....
  couldn't find diagnostic data in /usr/share/perl5/core_perl/pods/perldiag.pod /usr/local/lib/perl5/site_perl /usr/local/share/perl5/site_perl /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5/core_perl /usr/share/perl5/core_perl . ./mkman at /usr/share/perl5/core_perl/diagnostics.pm line 259, <POD_DIAG> line 704.
  Compilation failed in require at ./mkman line 6.
  BEGIN failed--compilation aborted at ./mkman line 6.
  make[1]: *** [Makefile:471: qperf.1] Error 2

This file is provided by perl-dev on Alpine, thus, adding it to
$makedepends

Measuring network performance.