RTEMS patch sweep 5

[Ralf Corsepius]

... and another one:

This patch addresses 2 issues with newlib's arm support:

* libc/machine/arm/machine/endian.h clashes with
libc/include/machine/endian.h.

The build machinery physically replaces libc/include/machine/endian.h 
with libc/machine/arm/machine/endian.h, resulting into broken installations.

* Several subtile issues in arm fpu handling in ieeefp.h.

Ralf
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