Clean up extern's in C files.

display.h

@@ -21,6 +21,9 @@ void mlwrite( const char *fmt, ...) ;
 void mlforce( char *s) ;
 void mlputs( char *s) ;
 void getscreensize( int *widthp, int *heightp) ;
+
+#ifdef SIGWINCH
 void sizesignal( int signr) ;
+#endif
 
 #endif

main.c

@@ -59,12 +59,16 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "estruct.h"	/* Global structures and defines. */
+#if UNIX
+#include <signal.h>
+#endif
+
 #include "basic.h"
 #include "bind.h"
 #include "bindable.h"
 #include "buffer.h"
 #include "display.h"
-#include "estruct.h"	/* Global structures and defines. */
 #include "globals.h"    /* Global definitions. */
 #include "eval.h"
 #include "execute.h"
@@ -89,11 +93,6 @@ extern unsigned _stklen = 32766;
 #endif
 
 #if UNIX
-#include <signal.h>
-#ifdef SIGWINCH
-extern void sizesignal(int);
-#endif
-
 static void emergencyexit(int signr)
 {
 	quickexit(FALSE, 0);

search.c

@@ -1471,7 +1471,6 @@ static int mceq(int bc, struct magic *mt)
 	return result;
 }
 
-extern char *clearbits(void);
 
 /*
  * cclmake -- create the bitmap for the character class.