[RFA/mingw32] environment variables are case-insensitive on win32

[Jerome Guitton]

Joel Brobecker (brobecker@adacore.com):

>   1. Decide whether we want GDB to match environment variable names
>      using case-sensitive or case-insensentive functions on cygwin.
>      Right now, it's case-sensitive. FWIW, we are offering to change
>      that behavior, and it seems more user-friencly at the moment,
>      but either choice is fine with me. If no concensus can be reached
>      on this, then we'll revert to the original behavior.
> 
>   2. Commit Jerome's patch which implements the decision from (1),
>      letting a more elaborate handling of environment variables
>      as a followup patch for someone more involved in cygwin than
>      we are.

At this point my feeling is that there is something to clarify for
Cygwin; the symptom being that the new test I submitted for
testenv.exp fails on this platform. But for the moment I'd be inclined
to let Cygwin's situation unchanged and let an expert handle it. The patch
that I would submit would fix mingw32 only. So I guess that would be (2).

The corresponding patch is in attachment.




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