Do not bother to implement this functionality for toolchains that are
assumed to be completely auto-detected (e.g. MSVC) or require
infrastructure around the toolchains to be useful (e.g. embedded platforms).
Change-Id: I3e7dfe2f3c30a0d2d2bb16364895151f95b16423
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>