Fix Makefile.build.mk for armv7l (#36976)
What does this MR do?
Similar to aarch64 becoming arm64 replace armv7l with arm.
Why was this MR needed?
Support building on Raspberry Pi 2B V1.1
What's the best way to test this MR?
run it on a raspberry pi or other arm-sbc. Otherwise maybe qemu emulator for arm. Just to be sure maybe check other arm but non-armv7l too, to make sure there is no change.
What are the relevant issue numbers?
Closes: #36976 (closed)
Edited by Alexander Puck Neuwirth