GMP patch: MinGW/win64 port

[Wesley W. Terpstra]

With the small attached patch, GMP compiles on MinGW/win64 using the  
latest cross compiler. The patch fixes the assumption that 'long = 64  
bits' on all intel 64 bit platforms. Under win64, long remains 32 bit  
< pointer size. Also, the ABI for windows differs from linux, so the  
patch disables linux-specific assembly, using the generic C instead.

The successful compile used the prebuilt cross-compiler mingw-w64- 
bin_i686_mings32_20071020.tar.bz2 with
./configure --build=athlon64-pc-mingw32 --host=x86_64-pc-mingw32 -- 
enable-alloca=malloc-reentrant
It is necessary to use 'malloc-reentrant' to forbid use of alloca,  
which appears to be broken under win64.

make check succeeds except for the tests t-locale and t-printf.
t-locale fails to compile because it tries to replace an imported  
function with a local copy of localeconv. Probably GMP shouldn't do  
this.
t-printf fails because the win64 printf ignores the high 32 bits of  
%llu.

In short, after this patch is applied, the remaining problems aren't  
GMP's fault.

I've CC'd the MLton list as this patch is relevant to a 64-bit windows  
port.
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