[Toybox] test.sh: Don't override "C" command path in TEST_HOST if it's set

[Rob Landley]

On 3/21/24 21:38, Oliver Webb via Toybox wrote:
> A mildly annoying issue of you are trying to test with different implementations of commands
> such as plan9 ones or sbase or busybox ones, things with different conflicting implementations 
> of things like xxd or vi. With this patch you can do "make test_cmd TEST_HOST=1 C=/path/to/other/cmd"
> and have it work

I've been doing "PATH=/path/to/thingy:$PATH TEST_HOST=1 make test_cmd" for
years, I didn't know that needed to be documented...

Rob