Added the 'const' qualifier to the 'fmt' argument for PR_FormatTime.

This patch is contributed by Ben Laurie <ben@algroup.co.uk>.
Files changed: prtime.h and prtime.c.

nsprpub/pr/include/prtime.h

@@ -261,7 +261,7 @@ PR_EXTERN(PRStatus) PR_ParseTimeString (
 #ifndef NO_NSPR_10_SUPPORT
 
 /* Format a time value into a buffer. Same semantics as strftime() */
-PR_EXTERN(PRUint32) PR_FormatTime(char *buf, int buflen, char *fmt, 
+PR_EXTERN(PRUint32) PR_FormatTime(char *buf, int buflen, const char *fmt, 
                                            const PRExplodedTime *tm);
 
 /* Format a time value into a buffer. Time is always in US English format, regardless

nsprpub/pr/src/misc/prtime.c

@@ -1609,7 +1609,7 @@ PR_ParseTimeString(
  */
 
 PR_IMPLEMENT(PRUint32)
-PR_FormatTime(char *buf, int buflen, char *fmt, const PRExplodedTime *tm)
+PR_FormatTime(char *buf, int buflen, const char *fmt, const PRExplodedTime *tm)
 {
     struct tm a;
     a.tm_sec = tm->tm_sec;