apache: bump to 2.4.41 & sync with master

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

14f4f0bef0
4e6bdd8a49
c8aba5113b
2d188fd37f
31e0d618e5
39e68309e8
a1472254db
d6476f30bb
258967b0d2
e94a08298e
6bd63d24f0
66bb68a7b6
d44ad09fcd

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>

net/apache/patches/010-reproducible-builds.patch

@@ -5,10 +5,8 @@ Author: Jean-Michel Vourgère <nirgal@debian.org>
 Forwarded: no
 Last-Update: 2015-08-11
 
-Index: apache2/server/buildmark.c
-===================================================================
---- apache2.orig/server/buildmark.c
-+++ apache2/server/buildmark.c
+--- a/server/buildmark.c
++++ b/server/buildmark.c
 @@ -17,11 +17,7 @@
  #include "ap_config.h"
  #include "httpd.h"
@@ -22,16 +20,14 @@ Index: apache2/server/buildmark.c
  
  AP_DECLARE(const char *) ap_get_server_built()
  {
-Index: apache2/server/Makefile.in
-===================================================================
---- apache2.orig/server/Makefile.in
-+++ apache2/server/Makefile.in
+--- a/server/Makefile.in
++++ b/server/Makefile.in
 @@ -1,3 +1,4 @@
 +export LC_ALL = C
  
  CLEAN_TARGETS = gen_test_char test_char.h \
  	ApacheCoreOS2.def httpd.exp export_files \
-@@ -85,8 +86,8 @@ httpd.exp: exports.c export_vars.h
+@@ -87,8 +88,8 @@ httpd.exp: exports.c export_vars.h
  	@echo "#! ." > $@
  	@echo "* This file was AUTOGENERATED at build time." >> $@
  	@echo "* Please do not edit by hand." >> $@