build: allow usage of a custom linker script

This change will allow the use of a custom linker script by
setting the config variable CUSTOM_LINKER_SCRIPT to a path outside
of Zephyr tree.

This is useful when an application needs to add sections into the
linker script and avoid having to change the script provided by
Zephyr.

Change-Id: Ibe31abcc8c0227e734f59bc26d3c8d5619951b29
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2 files changed