[patch #5731] Reduce platform dependence

[Ben Pfaff]

Follow-up Comment #3, patch #5731 (project pspp):

>This is an improvement, but obviously there is more to be done.

Portability is a process, not a product...

>> Remove `stat-macros' module. 
>Why did you do that? It no longer builds, since several files 
>include stat-macros.h

stat-macros.h is not useful.  Its functionality has been subsumed by the
sys_stat module.

I've now dropped #include "stat-macros.h" from everywhere it was included.

>While we're adjusting gl macros, can we get rid of strstr which no
>longer exists in gnulib ? 

OK.

> I think it's easier to read, if you put the function inside the
> #if / #endifs 

OK, done.

>I prefer this how it was before. 

OK, done.  I changed this to:


/* Returns true iff NAME specifies an absolute file name. */
bool
fn_is_absolute (const char *name)
{
  return name[0] == '/';
}


We could check for \ under windows, but what's the proper test macro for
that?  Should it be __WIN32__?

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