gdatetime.c: Fix MSVC builds for lack of NAN items
Use a fallback for isnan() on Visual Studio 2012 or earlier, and define NAN if it does not exist.
Trivial forward-port of !1831 (merged) to master
.
Use a fallback for isnan() on Visual Studio 2012 or earlier, and define NAN if it does not exist.
Trivial forward-port of !1831 (merged) to master
.