arch, linux, package: remove whitespaces

Whitespaces were searched using the following regex:

[ ]{1,}\t

and then manually removed in most of the cases. For
xserver_xorg-server.mk, tabs before backslashes were removed.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>