Use _LDBL_EQ_DBL in nexttowardf.c

[Tom de Vries]

Hi,

quoting from here ( https://sourceware.org/ml/newlib/2014/msg00688.html ):
...
 > Drop the FORCE_EVAL macro, and wrap nexttowardf in _LDBL_EQ_DBL as 
per > Craig's suggestion.
...

Actually, the patch that Jon submitted there is the same as before, and 
is missing those changes.

The commit does contain those changes, except that it uses the 
non-existing macro _LDBL_EQ_DOUBLE instead of _LDBL_EQ_DBL.

This patch fixes that.

OK?

[ Found this by running into a link error "unresolved symbol 
nexttowardf" for gcc testcase gcc/testsuite/gcc.dg/nextafter-2.c using 
the standalone nvptx toolchain. ]

Thanks,
- Tom
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