Sprinkle <sys/featuretest.h> where _*_SOURCE macros are consulted.

Otherwise, the feature tests might come out wrong. For example,
header files that check for _NETBSD_SOURCE won't get the default w

Sprinkle <sys/featuretest.h> where _*_SOURCE macros are consulted.

Otherwise, the feature tests might come out wrong. For example,
header files that check for _NETBSD_SOURCE won't get the default when
no other _*_SOURCE macros are defined; header files that check for
_POSIX_C_SOURCE might miss _XOPEN_SOURCE, which is supposed to imply
a corresponding _POSIX_C_SOURCE.

PR lib/58752: various header files test _*_SOURCE macros but don't
include sys/featuretest.h

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Fix FLT_* and DBL_* redefinition problem.

merge ktrace-lwp.

FPU fixes and improvements, adapted from openbsd:
- handle exceptions correctly
- emulation of unimplemented instructions (eg. on PA-7300LC)

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

* Move the definitions for types other than single-precision and double-
precision back to machine-dependent headers. C99 has no strict
requirement which, if any, extended-precision type `long d

* Move the definitions for types other than single-precision and double-
precision back to machine-dependent headers. C99 has no strict
requirement which, if any, extended-precision type `long double' must
match, and even between 80-bit formats there are differences in
implementation (m68k vs. x86).
* On arm, consider __VFP_FP__.

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update for LWPs, and some lite cleanup.

PR/3012: Greg A. Woods: Write all float.h files [except the vax of course]
in terms of float_ieee.h

Added files to support generic HP PA-RISC based machines. hp700-specific
files to follow.