BLD: Init PyDateTimeAPI Warnings

[alimcmaster1]

• Fixes below warning:

In file included from pandas/_libs/src/ujson/python/date_conversions.h:7:0,
                 from pandas/_libs/src/ujson/python/date_conversions.c:4:
/home/vsts/miniconda3/envs/pandas-dev/include/python3.7m/datetime.h:204:25: warning: ‘PyDateTimeAPI’ defined but not used [-Wunused-variable]
 static PyDateTime_CAPI *PyDateTimeAPI = NULL;

#32163 (comment) (will check CI)

Still same warning coming from np_datetime and np_datetime_strings

[jbrockmendel]

does this have any impacts other than silencing the warning? build time/size?

[alimcmaster1]

aaaah! - this doesn't work as intended (seemed fine locally) back to the drawing board...