Fix all implicit declarations

AC_HEADER_TIME is only needed if you need to include time.h and
sys/time.h at the same time.

The truth is this codebase is an unholy mess but at least this fixes
the warnings.

configure.ac

@@ -26,7 +26,6 @@ AC_C_CONST
 AC_C_CHAR_UNSIGNED
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
-AC_HEADER_TIME
 AC_STRUCT_TM
 
 AC_FUNC_ALLOCA

gram.y

@@ -13,7 +13,6 @@ extern void set_mwb_palette(void);
 extern void set_schwartz_palette(void);
 extern void set_custom_palette(char *fn);
 extern void add_toolitem(char *, char *, char *, int);
-extern Scrn *openscreen(char *, Window);
 extern void create_module(Scrn *, char *, char *);
 extern char *default_colors[NUMDRIPENS];
 extern char *default_screenfont, *label_font_name;
@@ -44,6 +43,17 @@ static void append_to(char **x, char *y)
 }
 
 static int ti_level=0;
+
+int yylex();
+
+extern char *progname;
+extern int ParseError;
+int yyerror(s) char *s;
+{
+    fprintf (stderr, "%s: error in input file:  %s\n", progname, s ? s : "");
+    ParseError = 1;
+    return 0;
+}
 %}
 
 %union
@@ -197,11 +207,3 @@ forcemove_policy : ALWAYS { $$ = FM_ALWAYS; }
 		 ;
 
 %%
-extern char *progname;
-extern int ParseError;
-int yyerror(s) char *s;
-{
-    fprintf (stderr, "%s: error in input file:  %s\n", progname, s ? s : "");
-    ParseError = 1;
-    return 0;
-}

icc.c

@@ -5,6 +5,7 @@
 #include "style.h"
 #include "prefs.h"
 
+#include <stdlib.h>
 #include <string.h>
 #include <stdlib.h>
 

kbdmodule.y

@@ -8,6 +8,14 @@ void docmd(XEvent *e, void *callback)
   ((void (*)(Window))callback)(e->xany.window);
 }
 
+int yylex();
+
+char *progname;
+int yyerror(s) char *s;
+{
+    fprintf (stderr, "%s: error in input file:  %s\n", progname, s ? s : "");
+    return 0;
+}
 %}
 
 %union
@@ -55,14 +63,6 @@ command			: FUNCTION { $$=$1; }
 
 %%
 
-char *progname;
-
-int yyerror(s) char *s;
-{
-    fprintf (stderr, "%s: error in input file:  %s\n", progname, s ? s : "");
-    return 0;
-}
-
 int main(int argc, char *argv[])
 {
   char *arg=md_init(argc, argv);

module.c

@@ -13,9 +13,6 @@
 #ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
 #endif
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
 #ifdef HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
 #endif
@@ -42,7 +39,6 @@ extern Display *dpy;
 extern void add_fd_to_set(int);
 extern void remove_fd_from_set(int);
 
-extern void screentoback();
 extern void raiselowerclient(Client *, int);
 extern void wberror(Scrn *, char *);
 extern void reparent(Client *);

ppmtoinfo.c

@@ -1,12 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
 
 #define WB_DISKMAGIC	0xe310
 #define WB_DISKVERSION	1

screen.h

@@ -47,4 +47,9 @@ extern Scrn * openscreen(char *, Window);
 extern void realizescreens();
 extern void screentoback();
 
+void closescreen();
+Scrn *openscreen(char *deftitle, Window root);
+void realizescreens();
+void screentoback();
+
 #endif