Illumos/gate 685c1a2usr/src/head/iso math_c99.h, usr/src/lib/libm/common/C jn.c tanh.c

11175 libm should use signbit() correctly
11188 c99 math macros should return strictly backward compatible values
Reviewed by: Andy Fiddaman <andy at omniosce.org>
Reviewed by: Igor Kozhukhov <igor at dilos.org>
Approved by: Dan McDonald <danmcd at joyent.com>
DeltaFile
+150-116usr/src/lib/libm/common/Q/jnl.c
+146-107usr/src/lib/libm/common/LD/jnl.c
+140-106usr/src/lib/libm/common/C/jn.c
+8-7usr/src/lib/libm/common/Q/__rem_pio2l.c
+8-6usr/src/lib/libm/common/Q/atan2l.c
+5-5usr/src/head/iso/math_c99.h
+4-3usr/src/lib/libm/common/C/tanh.c
+3-2usr/src/lib/libm/common/LD/__rem_pio2l.c
+464-3528 files

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