[Toybox] [PATCH] Pass cflags and hostcc in mkroot.

[Denys Nykula]

To build working armv7l binaries natively, I set march, mfpu and
mfloat-abi CFLAGS specific for the device. Otherwise they can't run,
illegal instruction.

Binaries in generated/, kconfig/ and root/airlock/toybox/ are
dynamically linked by default, so to bootstrap a musl root with a
downloaded musl toolchain from a glibc host without its own toolchain, I
append -static to both CFLAGS and full compiler path in HOSTCC.
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