Zephyr SDK 0.13.1

• gdb:

  • Fix ELF file format support issue on MacOS

• newlib:

  • Fixed Xtensa malloc failure issue reported in zephyrproject-rtos/zephyr#38258.

• gcc:

  • Pull in patches for Arm-GCC-CVE-2021-35465 (https://nvd.nist.gov/vuln/detail/CVE-2021-35465)

• qemu:

  • Allow setup of ARC's "virt" board memory size