[gfortran] patch PR 20788

Mon May 2 07:51:00 GMT 2005

Dynamically loading libgfortran.so breaks C I/O routines when stdout is 
redirected to a file (same thing for stdin and stderr). This annoys people 
dynamically loading Fortran subroutines for use in a C project (example: R,
see PR fortran/20788 for details).

Attached patch fixes this by disabling use of mmap on stdin, stdout and 
stderr. Profiling shows no performance degradation (all time spent in I/O on 
preconnected units is formatting).

Regtested on i386-linux. OK for mainline and 4.0?
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