Fix build with clang

PR:		ports/161117
Submitted by:	Klaus Aehlig <aehlig@linta.de>
Approved by:	maintainer timeout (4 weeks)

games/sl/files/patch-sl.c

@@ -0,0 +1,59 @@
+--- sl.c.orig	1998-07-22 16:01:01.000000000 +0200
++++ sl.c	2011-11-01 18:53:45.000000000 +0100
+@@ -32,6 +32,11 @@
+ #include <unistd.h>
+ #include "sl.h"
+ 
++void add_man(int, int);
++int add_D51(int);
++int add_sl(int);
++void add_smoke(int,int);
++
+ int ACCIDENT  = 0;
+ int LOGO      = 0;
+ int FLY       = 0;
+@@ -59,7 +64,7 @@
+     }
+ }
+ 
+-void main(int argc, char *argv[])
++int main(int argc, char *argv[])
+ {
+     int x, i;
+ 
+@@ -85,6 +90,8 @@
+     }
+     mvcur(0, COLS - 1, LINES - 1, 0);
+     endwin();
++
++    return 0;
+ }
+ 
+ 
+@@ -129,7 +136,7 @@
+ }
+ 
+ 
+-add_D51(int x)
++int add_D51(int x)
+ {
+     static char *d51[D51PATTERNS][D51HIGHT + 1]
+ 	= {{D51STR1, D51STR2, D51STR3, D51STR4, D51STR5, D51STR6, D51STR7,
+@@ -170,7 +177,7 @@
+ }
+ 
+ 
+-int add_man(int y, int x)
++void add_man(int y, int x)
+ {
+     static char *man[2][2] = {{"", "(O)"}, {"Help!", "\\O/"}};
+     int i;
+@@ -181,7 +188,7 @@
+ }
+ 
+ 
+-int add_smoke(int y, int x)
++void add_smoke(int y, int x)
+ #define SMOKEPTNS	16
+ {
+     static struct smokes {