darcs patch: FIX BUILD `set -o igncr'-issue on FreeBSD (and 2 more)

[Simon Marlow]

I'm validating these.

Simon

jochemberndsen at dse.nl wrote:
> Wed Sep 26 22:37:50 CEST 2007  jochemberndsen at dse.nl
>   * FIX BUILD `set -o igncr'-issue on FreeBSD
>   `set -o igncr' does not work on non-cygwin-systems.
>   Fail silently if this command does not work, instead
>   of aborting the build.
>   
> 
> Thu Sep 27 15:26:19 CEST 2007  jochemberndsen at dse.nl
>   * FIX BUILD addDLL returns const char*
>   addDLL returns const char*, not just a char*.
>   Fix compiler warning
> 
> Thu Sep 27 15:26:49 CEST 2007  jochemberndsen at dse.nl
>   * FIX BUILD FD_SETSIZE signed
>   On FreeBSD FD_SETSIZE is unsigned. Cast it to a signed int
>   for portability.
> 
> 
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