BLD: json mingw doesnt have sprintf_s
Merge pull request #4778 from Komnomnomnom/json-win-build-oops

BLD: windows builds failing in pandas.json (#4764)
TST: windows dtype 32-bit fixes
FIX: iso date encoding year overflow
Merge pull request #4870 from Komnomnomnom/win-dtype-32-bit-fixes

TST: windows dtype 32-bit fixes
Merge pull request #4871 from Komnomnomnom/iso-date-overflow

FIX: iso date encoding year overflow