Run pre-installed pioasm and elf2uf2 if found in system search path

[lurk101]

Bypass prior logic if executable is found in system search path, otherwise unchanged.

[lurch]

You seem to have progran in many places - was that supposed to be program ?

[lurk101]

You seem to have progran in many places - was that supposed to be program ?

No longer used in current patch

[lurch]

I'm afraid I don't know much about CMake, but how does this interact with #1221 ?

[lurk101]

I'm afraid I don't know much about CMake, but how does this interact with #1221 ?

I could be wrong but I believe #1221 applies only to Windows. It doesn't seem to have any effect in Linux. Unfortunately I don't have a Windows install to test with.