Meaning that the FFI is aware of it, so you can send arbitrary byte data
to foreign calls. Fixes#209
This means that we no longer need the hacky way of reading and writing
binary data via scheme, so can have a more general interface for reading
and writing buffer data in files.
It will also enable more interesting high level interfaces to binary
data, with C calls being used where necessary.
Note that the Buffer primitive are unsafe! They always have been, of
course... so perhaps (later) they should have 'unsafe' as part of their
name and better high level safe interfaces on top.
This requires updating the scheme to support Buffer as an FFI primitive,
but shouldn't affect Idris2-boot which loads buffers its own way.
It seems relevant to all BSD systems.
In xcode the option -Wno-error-implicit-function-declaration is enabled. So the following error occured:
Idris2/support/c/idris_file.c:76:13: Missing '#include <sys/time.h>'; declaration of 'select' must be imported from module 'Darwin.POSIX.sys.time' before it is required
I hope it won't break anything on linux.
