* Tools shim maker and env path handling
Includes component:
* Given executable, create shim (all three OSs)
* Add executable path to Env PATH during first run
* including manual instruction when there is no access
If the LZMA archive is missing, the first-run message is printed every time.
This commit fixes that.
Split the first-run message into two pieces:
- The first-run (welcome and telemetry) message is printed only once, no matter
whether the cache was primed or not.
- The cache-priming message is printed only if the cache is avaialble.
Otherwise skip the cache introduction and the ccache priming operation.