apache: bump to 2.4.41 & sync with master

apache: bump to 2.4.41 & sync with master

This is a squash of the following cherry-picked commits:

14f4f0bef0448d950cf1371de3a05f302a2779c8
4e6bdd8a496bcf202f59e66bff1042512b49a972
c8aba5113bbe90202c87bad9db9d4c72ccc6afa2
2d188fd37f1d571f7315075b4be6538c8a125caf
31e0d618e5d8e35264d827f4de46a8b4e2535122
39e68309e8279d68496f649140f6df8ce59a3efd
a1472254db1332a3138ef7305bdc9953cfa1b8c2
d6476f30bbe06547aea23eec303294305eeb29f4
258967b0d29e4cecc9c70b10b160bda8e903665e
e94a08298e81b97d43e63e05cca167d778ff8d58
6bd63d24f0d147ca891332fe408eb279c9117dc3
66bb68a7b6413acba07fd22f7c71203e760145eb
d44ad09fcd81cafeafbca78c4e2599774f7ef76b

Short summary:

- version is bumped to 2.4.41
- httpd is renamed to apache2 to avoid overwriting of other servers (for
  instance busybox's httpd)
- the name apache2 is now also used for directories, for instance
  /etc/apache2 instead of /etc/apache
- a simple init script it added (/etc/init.d/apache2)
- a user "apache" is added upon package installation and used by default
- adds the Apache modules (in the main package as well as in additional
  packages)
- Makefile and patches are updated and cleaned
- adds myself as maintainer
- improves the cross-compile setup (via configure variables, patches &
  sed scripts)
- apxs is fixed up so that external modules can be added easily

For more details please check the individual commits provided above.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>