Update machine flags for Cortex-M3 and Cortex-M4 based BSPs to account for Cortex-M3 Errata 602117 which required GCC multilib changes. Update #3747.
Adjust various build files. Remove automatic generation of the c/src/lib/libbsp/*/acinclude.m4 files from bootstrap script. This patch is a part of the BSP source reorganization. Update #3285.