[Bug 217845] Replace SOFTFLOAT tests with __mips_soft_float, which gcc/clang define for us.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217845

            Bug ID: 217845
           Summary: Replace SOFTFLOAT tests with __mips_soft_float, which
                    gcc/clang define for us.
           Product: Base System
           Version: CURRENT
          Hardware: mips
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dnelson_1901 at yahoo.com

Created attachment 180878
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180878&action=edit
Replace SOFTFLOAT tests with __mips_soft_float, which gcc/clang define for us.

Replace SOFTFLOAT tests with __mips_soft_float, which gcc/clang define for us.

base r308130 (review D8376) extended softfloat/hardfloat support, but used a
macro that never actually gets set except in libc and msun's Makefile.inc.  So
libc and libm got built correctly, but any program including fenv.h itself
assumed it was on a hardfloat systen and emitted inline fpu instructions for
fedisableexcept() and friends.

Using __mips_soft_float is better, since it's a compiler-internal macro that is
always set correctly for the target.

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