[PATCH] Check for the appropriate condition in types.h

[Javier Martín]

Currently <grub/types.h> verifies that sizeof(void*)==sizeof(long) and
then proceeds to define most fixed-length types based on sizeof(void*).
While simplification seems a good idea on paper, it is always good
practice to check specifically for what we want to know. In particular,
the assumption that long can hold a pointer will go down when (if)
mingw64 support is merged, because Win64 follows the LLP64 model instead
of the LP64 *nix model.

Given that currently both values are, by precondition, the same, this
change is guaranteed not to create any problems, while it might avoid
them in the future.

-- 
-- Lazy, Oblivious, Recurrent Disaster -- Habbit

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