Inconsistent guards for internal and user types

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

Hello,

Newlib defines defaults for internal types via <sys/_types.h> and uses 
<machine/_types.h> to let systems define their own type if necessary. 
For example

#ifndef __dev_t_defined
typedef short __dev_t;
#endif

However, the __*_t_defined pattern conflicts with the glibc type guard 
pattern for user types, e.g. dev_t in this this example. I suggest to 
introduce a __machine_*_t_pattern for internal types (defined by 
<machine/_types.h>, used by <sys/_types.h>). For example

#ifndef __machine_dev_t_defined
typedef short __dev_t;
#endif

--
Sebastian Huber, embedded brains GmbH

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