[PATCH] simplify ulimit implementation

[Pino Toscano]

Hi,

the current ulimit implementation used for Hurd, 
sysdeps/unix/bsd/ulimit.c, is buggy (produces wrong return values, 
different function name vs weak alias), while the one for Linux 
(sysdeps/unix/sysv/linux/ulimit.c) is better; thus, I decided to remove 
the bsd implementation and move the linux one as unix sysdeps (I 
initially thought as posix, but since it implements non-standard values 
I went for unix).
The only drawback of this operation is that for non-Linux 
implementations, using bsd sysdeps and not providing an own ulimit, lose 
the (non-standard) __UL_GETMAXBRK case. Can this be considered 
acceptable?

Thanks,
-- 
Pino Toscano
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