[PATCHv2 1/5] compiler.h: add host_build()

[sbabic at denx.de]

> Add a host_build() function, so that it's possible to
> check for software being build with USE_HOSTCC without
> relying on preprocessor conditions. In other words
>  #ifdef USE_HOSTCC
>  	host_only_code();
>  #endif
> can be written like this instead:
>  if (host_build())
>  	host_only_code();
> This improves code readability and test coverage and
> compiler will eleminate this unreachable code.
> Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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