[patch] Find if we are big endian at compile time

[Rafael Espíndola]

I need to specialize a template on the *host* endianness and noticed
we don't have any integer constant expression with that information
available.

Most projects find this with a configure/cmake check, but that is not
a good idea since it would break building fat binaries.

I tried porting the existing check to compile time, but I could not
figure out how to do it.

The attached patches just use the compiler provided macros.

Cheers,
Rafael
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