various: fix hostPlatform.canExecute buildPlatform

It doesn't matter whether the hostPlatform could execute stuff from the
buildPlatform - we need it the other way around: Certain things during a
build process can only happen when, as part of the build, the
**buildPlatform** can execute the code it just created for the
**hostPlatform**.

Unless we are talking about compilation at run-time, as in the case of
PostgreSQL. Extend the comment there to make it clear that this is on
purpose. Another case that's OK is vlc, where luac can't cross-compile
at build time, thus the bytecode is actually build for the buildPlatform
and the sources must be interpreted at runtime instead.

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