New function ltime() returns a struct tm of the current local time.

Fixes crashes when time() returns (time_t)-1 on Windows by using the
Win32 GetLocalTime() function.  (The Unix implementation still just 
uses time() and localtime().)

[originally from svn r5086]

misc.h

@@ -5,6 +5,7 @@
 
 #include <stdio.h>		       /* for FILE * */
 #include <stdarg.h>		       /* for va_list */
+#include <time.h>                      /* for struct_tm */
 
 #ifndef FALSE
 #define FALSE 0
@@ -41,6 +42,8 @@ void bufchain_prefix(bufchain *ch, void **data, int *len);
 void bufchain_consume(bufchain *ch, int len);
 void bufchain_fetch(bufchain *ch, void *data, int len);
 
+struct tm ltime(void);
+
 /*
  * Debugging functions.
  *