build:Only keep one ref to .settings and allow to override it.
build:Only keep one ref to .settings and allow to override it.

Rreleasetools/arm_sdimage.sh uses a ".settings" file to allow to override
the defaults settings found in arm_sdimage. This change allows to use an
alternate file for this purpose. We figured out more programs (like eclipse)
use a ".settings" file.

One can tweak the settings files to use by settings the SETTINGS_MINIX
variable

 SETTING_MINIX=.settings_minix

Change-Id: I57f5ca64d2ac27c9e015ab24b864b9a5f14c42fb

http://gerrit.minix3.org/#/c/2687/

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi