Makefile: link arch/ last
Makefile: link arch/ last

The IRQ implementations of ARC, ARM, and Nios II use .gnu.linkonce
sections for declaring entires in the sw_isr_table array. It's
imperative that arch/built-in.o be linked after everything else
as we want custom interrupt handlers to take precedence over the
default spurious interrupt handlers.

Currently, any interrupt handlers defined in ext/ or usb/ will not
be installed properly on the above mentioned arches.

Change-Id: Ib3fb21ff1ef114678906f130c268c266535954f1
Signed-off-by: Andrew Boie <aab045b28152628be6af0e556050d0381fd0a34d@intel.com>

tidyjiang8/zephyr-doc,erwango/zephyr,sharronliu/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,runchip/zephyr-cc3200,runchip/zephyr-cc3220,mbolivar/zephyr,fractalclone/zephyr-riscv,nashif/zephyr,bboozzoo/zephyr,pklazy/zephyr,rsalveti/zephyr,rsalveti/zephyr,aceofall/zephyr-iotos,explora26/zephyr,GiulianoFranchetto/zephyr,fbsder/zephyr,rsalveti/zephyr,bigdinotech/zephyr,finikorg/zephyr,tidyjiang8/zephyr-doc,pklazy/zephyr,sharronliu/zephyr,ldts/zephyr,kraj/zephyr,holtmann/zephyr,zephyrproject-rtos/zephyr,bboozzoo/zephyr,tidyjiang8/zephyr-doc,ldts/zephyr,finikorg/zephyr,fractalclone/zephyr-riscv,ldts/zephyr,erwango/zephyr,punitvara/zephyr,sharronliu/zephyr,explora26/zephyr,sharronliu/zephyr,Vudentz/zephyr,holtmann/zephyr,mbolivar/zephyr,explora26/zephyr,runchip/zephyr-cc3220,ldts/zephyr,zephyriot/zephyr,finikorg/zephyr,runchip/zephyr-cc3200,zephyrproject-rtos/zephyr,aceofall/zephyr-iotos,fractalclone/zephyr-riscv,punitvara/zephyr,erwango/zephyr,rsalveti/zephyr,holtmann/zephyr,tidyjiang8/zephyr-doc,sharronliu/zephyr,finikorg/zephyr,kraj/zephyr,mirzak/zephyr-os,punitvara/zephyr,galak/zephyr,holtmann/zephyr,fbsder/zephyr,mbolivar/zephyr,erwango/zephyr,zephyriot/zephyr,bboozzoo/zephyr,Vudentz/zephyr,punitvara/zephyr,fractalclone/zephyr-riscv,galak/zephyr,galak/zephyr,erwango/zephyr,tidyjiang8/zephyr-doc,mbolivar/zephyr,Vudentz/zephyr,explora26/zephyr,explora26/zephyr,fbsder/zephyr,zephyriot/zephyr,kraj/zephyr,runchip/zephyr-cc3200,zephyriot/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,runchip/zephyr-cc3220,Vudentz/zephyr,nashif/zephyr,fbsder/zephyr,bigdinotech/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,aceofall/zephyr-iotos,bboozzoo/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,nashif/zephyr,finikorg/zephyr,holtmann/zephyr,runchip/zephyr-cc3200,kraj/zephyr,mirzak/zephyr-os,nashif/zephyr,mirzak/zephyr-os,nashif/zephyr,bigdinotech/zephyr,mirzak/zephyr-os,Vudentz/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,bigdinotech/zephyr,mirzak/zephyr-os,pklazy/zephyr,pklazy/zephyr,kraj/zephyr,galak/zephyr,pklazy/zephyr,rsalveti/zephyr,Vudentz/zephyr,runchip/zephyr-cc3200,bigdinotech/zephyr,fractalclone/zephyr-riscv,runchip/zephyr-cc3220,fbsder/zephyr,runchip/zephyr-cc3220,galak/zephyr,bboozzoo/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr