[PATCH] [BZ #2749] soft-fp fixes updated again

[Steven Munroe]

Moved fenv-libc.h to ports and will submit a separate patch for that.
Jakub provided an alternative to the _FP_PACK_SEMIRAW change to fix
FP_TRUNC directly. Finally updated math/basic-test.c to verify correct
truncation (double to float, long double to float, and long double to
double) of NaN and Infinity values.

The ldbl-128ibm patch
<http://sources.redhat.com/ml/libc-alpha/2007-01/msg00023.html> is still
applicable and has not changed.

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