[Bug c++/100460] [11/12/13 Regression][modules] mingw build broken due to use of unsupported open() flags

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100460

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The way libgfortran fixed this two ways.
First way is to use umask (disabled for mingw though). Second way is doing
#ifndef/#define 0

See:
r6-2699-g18a2180daa88bc
r0-63059-g41724e6a1387d9