[PATCH] add spu fenv support

[Patrick Mansfield]

OK, updated patch to add spu fenv code,  third version, changes from last
posting are:

- include all libm spu headers via #include "headers/file.h"

- move base fenv.h into ./newlib/libc/machine/spu/include/fenv.h

- add proper license to ./newlib/libc/machine/spu/sys/fenv.h

-- Patrick Mansfield
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