[Patch, libgFortran] Fix MinGW64 compile warning

[Tobias Burnus]

The attached patch fixes a compiler warning on MinGW64

../../../../../build/gcc/src/libgfortran/io/unix.c:51:0: warning: 
"lseek" redefined [enabled by default]

which is due to MinGW64 now supporting LFS. (Seemingly, using a similar 
define as libgfortran.) The following patch should fix the issue.

Thanks for Kai for suggestions and testing the patch on MinGW64. The 
goal is that it also works with older MinGW64 and with 32bit MinGW, but 
that has not been tested ...

OK for the trunk?

Tobias
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