crust build fails when cc link is missing (e.g. minimal Ubuntu 20.04)
use host-gcc from the toolchain instead.
addition of the patch fixes the following error.
BUILD crust (target)
TOOLCHAIN manual
...
HOSTCC build/3rdparty/kconfig/conf.o
/bin/sh: 1: exec: cc: not found
make[1]: *** [Makefile:170: build/3rdparty/kconfig/conf.o] Error 127
...
Crust improves battery life and thermal performance by implementing a deep
sleep state. During deep sleep, the CPU cores, the DRAM controller, and most
onboard peripherals are powered down, reducing power consumption by 80% or more
compared to an idle device. On boards without a PMIC, Crust is also responsible
for orderly power-off and power-on of the device.
