MacOS 10.15 now includes "aligned_alloc".  Disagreement between the
headers and the binaries about whether aligned_alloc exists leads to
a compilation failure (see #73319 and the detailed comment in this
commit).

This fixes problems with missing symbols when using clang as library and
is most likely a result of llvm being build with RTTI enabled.

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

Updated for compatibility with perl 5.32

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

Added Pod::Parser as a dependency, since perl 5.32 no longer includes
this module in core.

icu: 64 -> 67

This upgrades dbus-python to the 1.2.16 release. Reason for this version
upgrade is a the failing hamster application (see. programs.hamster).
With a 1.2.12 dbus-python version hamster can not start and fails with:

    Traceback (most recent call last):
      File "/nix/store/5ax21lyiprc9v5l3pl7dbfr2hqbrh970-hamster-3.0.2/bin/.hamster-wrapped", line 41, in <module>
        from hamster import client, reports
      File "/nix/store/5ax21lyiprc9v5l3pl7dbfr2hqbrh970-hamster-3.0.2/lib/python3.8/site-packages/hamster/client.py", line 46, in <module>
        assert not (
    AssertionError: python3.8 changed str(<dbus integers>).
       That broke hamster (projecthamster/hamster#477).
       Please upgrade to dbus-python >= 1.2.14.

https://ftp.gnome.org/pub/GNOME/sources/pygobject/3.36/pygobject-3.36.1.news

Backwards incompatible changes:
- Removed support for passing an Extension instance to
  from_issuer_subject_key_identifier(), as per our deprecation policy.
- Support for LibreSSL 2.7.x, 2.8.x, and 2.9.0 has been removed (2.9.1+
  is still supported).
- Dropped support for macOS 10.9, macOS users must upgrade to 10.10 or
  newer.
- RSA generate_private_key() no longer accepts public_exponent values
  except 65537 and 3 (the latter for legacy purposes).
- X.509 certificate parsing now enforces that the version field contains
  a valid value, rather than deferring this check until version is
  accessed.

Deprecations:
- Deprecated support for Python 2. At the time there is no time table
  for actually dropping support, however we strongly encourage all users
  to upgrade their Python, as Python 2 no longer receives support from
  the Python core team.

Right now we add glibc to search path also -nostdinc was provided,
which breaks projects providing their own gcc.

Fix GCC compilation on MacOS 10.15

libv4l: 1.18.1 -> 1.20.0

This disabled systemd-journal-upload and systemd-journal-remote.

We didn't install the unit files anyways, so this was probably not used
at all, and currently fails to build due to libmicrohttpd and systemd
code being incompatible:

```
../src/journal-remote/journal-remote-main.c: In function ‘setup_microhttpd_server’:
../src/journal-remote/journal-remote-main.c:431:38: error: passing argument 5 of ‘MHD_start_daemon’ from incompatible pointer type [-Werror=incompatible-pointer-types]
```

systemd: disable remote support

It is deprecated and an optional requirement.