[OpenMP] Fix incorrect parameters to sscanf_s call

[jlpeyton]

Summary

On Windows, the documentation states that when using sscanf_s,
each %c and %s specifier must also have additional size parameter.
This patch adds the size parameter in the one place where %c is used.

[AndreyChurbanov]

LGTM

openmp/runtime/src/kmp_settings.cpp

int __kmp_convert_to_milliseconds(char const *data) {
   double value;
 
   if (data == NULL)
     return (-1);
   if (__kmp_str_match("infinit", -1, data))
     return (INT_MAX);
   value = (double)0.0;
   mult = '\0';
+#if KMP_OS_WINDOWS
+  // On Windows, each %c parameter needs additional size parameter for sscanf_s
+  nvalues = KMP_SSCANF(data, "%lf%c%c", &value, &mult, 1, &extra, 1);
+#else
   nvalues = KMP_SSCANF(data, "%lf%c%c", &value, &mult, &extra);
+#endif
   if (nvalues < 1)
     return (-1);
   if (nvalues == 1)
     mult = '\0';
   if (nvalues == 3)
     return (-1);
 
   if (value < 0)