PATCH libgfortran mmap fixes for MinGW

[Aaron W. LaFramboise]

Windows does not have mmap (The equivilent MapViewOfFileEx has a
different interface unfortunately.)

These changes fix this source of incompatibility in unix.c by adding
checking for <sys/mman.h>, the _PROT macros, and including <stdio.h>.

Aaron W. LaFramboise

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