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/

This reverts commit d15d3f4b5215614701f41909ff864fd583fd8530.

The build fails on kernels with PaX:
Traceback (most recent call last):
  File "setup.py", line 4, in <module>
    from setuptools import setup
  File "/usr/lib/python3.6/site-packages/setuptools/__init__.py", line
14, in <module>
    from setuptools.dist import Distribution, Feature
  File "/usr/lib/python3.6/site-packages/setuptools/dist.py", line 20,
in <module>
    from setuptools import windows_support
  File "/usr/lib/python3.6/site-packages/setuptools/windows_support.py",
line 2, in <module>
    import ctypes
  File "/usr/lib/python3.6/ctypes/__init__.py", line 538, in <module>
    _reset_cache()
  File "/usr/lib/python3.6/ctypes/__init__.py", line 273, in
_reset_cache
    CFUNCTYPE(c_int)(lambda: None)
MemoryError

Apparently it is related to libffi.
Revert to unblock the builder for now.

This reverts commit 771975ffc4c0e4e9f467af146d61bd94d95722d8.