[PATCH] add __ASSUME_MREMAP

[Pino Toscano]

Hi,

just like it is done also for other functions, add a __ASSUME_MREMAP in 
kernel-features.h (only in the Linux version) to indicate the 
availability of mremap; this is used to uniform the two existing checks:
- malloc.c enables it if linux is defined
- libio uses _G_HAVE_MREMAP (from _G_config.h)
The comment for __ASSUME_MREMAP in kernel-features.h has been taken from 
malloc.c, just above the HAVE_MREMAP definition.

After this patch, sysdeps/unix/sysv/linux/_G_config.h becomes the same 
as sysdeps/generic/_G_config.h; after review and commit of this, I will 
send a new patch to get rid of the linux _G_config.h.

Thanks,
-- 
Pino Toscano
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