[m-rev.] for review: Delete if-cross-compiling actions in AC_TRY_RUN calls.

[Julien Fischer]

On Mon, 5 Mar 2018, Peter Wang wrote:

> If AC_TRY_RUN cannot proceed because we are cross-compiling, we tended
> to silently assume a result, usually the same result as if the
> AC_TRY_RUN test had failed. But this might not be correct, or it might
> be sub-optimal. It is better for the AC_TRY_RUN to loudly complain so
> that the user is aware that something needs to be done.

Good idea.

> configure.ac:
>    Delete most action-if-cross-compiling arguments in calls to AC_TRY_RUN.

That's fine.

Julien.