vim-patch:8.1.2326: cannot parse a date/time string

Problem:    Cannot parse a date/time string.
Solution:   Add strptime(). (Stephen Wall, closes #)
10455d43fe

N/A patches for version.c:

vim-patch:8.1.2344: Cygwin: warning for using strptime()

Problem:    Cygwin: warning for using strptime().
Solution:   Move defining _XOPEN_SOURCE and __USE_XOPEN to vim.h. (Ken Takata,
            closes vim/vim#5265)  Use 700 for _XOPEN_SOURCE for mkdtemp().
6a228c6463

src/nvim/eval.lua

@@ -341,6 +341,7 @@ return {
     string={args=1},
     strlen={args=1},
     strpart={args={2, 4}},
+    strptime={args=2},
     strridx={args={2, 3}},
     strtrans={args=1},
     strwidth={args=1},