remove system library prototypes

cde/programs/dtcm/dtcm/calendarA.c

@@ -151,9 +151,6 @@ extern int errno;
 #define NL_CAT_LOCALE       0
 #endif
 
-extern time_t timelocal();	/* LINT */
-extern char * getlogin();	/* LINT */
-extern void(*sigset())();
 extern int cmtt_init(char *, Calendar *, XtAppContext, Widget);
 extern void show_about(Widget, XtPointer, XtPointer);
 

cde/programs/dtcm/dtcm/tempbr.c

@@ -89,11 +89,7 @@ static  char sccsid[] = "@(#)tempbr.c 1.48 95/03/28 Copyr 1991 Sun Microsystems,
 static void tb_cancel_cb();
 static void tb_close_cb();
 static void tempbr_show_cb(Widget w, XtPointer data, XtPointer cbs);
-#if defined(__linux__)
 #include <string.h>
-#else
-extern char *strdup(const char *);
-#endif
 
 #ifdef FNS_DEMO
 /* This stuff is currently broken */

cde/programs/dtcm/libDtCmP/getdate.y

@@ -157,7 +157,6 @@ static int mdays[12] =
 	{31, 0, 31,  30, 31, 30,  31, 31, 30,  31, 30, 31};
 #define epoch BOT_YEAR
 
-extern struct tm *localtime();
 time_t dateconv(int mm, 
     int dd, 
     int yy,