package/apache: fix nios2 detection

Apache treats nios2 as OS/2 which is wrong.

Fixes
http://autobuild.buildroot.net/results/27c/27c5848a344c7e16feefcbd3773b50a78d6e63f0/
http://autobuild.buildroot.net/results/d8c/d8cf103033c63e79ed2db0b600f120f6fcb5b5e9/
http://autobuild.buildroot.net/results/1de/1dec866cf9a5f731a9ed93dff5b8b98001863635/
http://autobuild.buildroot.net/results/776/776be8ef579e3444123d8183dca1062ece656436/
http://autobuild.buildroot.net/results/5d2/5d21ac2d8f008d984d6f8b359ebb0e2482545683/
http://autobuild.buildroot.net/results/87f/87f25b20f63eebf7f75e35064bad79e3d383e7a8/
http://autobuild.buildroot.net/results/1b7/1b75f52c70af7880d523185565b7aaf59d9f9b3e/



[Thomas: adjust patch so that it continues to match OS/2 properly,
while still not matching NIOS2.]

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