Add static keywords to variables and functions where possible in games/.

This allows us to detect unused functions and variables and allows the
compiler to do a better job at optimisation.

games/bcd/bcd.c

@@ -82,7 +82,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
-u_short holes[256] = {
+static u_short holes[256] = {
     0x0,	 0x0,	  0x0,	   0x0,	    0x0,     0x0,     0x0,     0x0,
     0x0,	 0x0,	  0x0,	   0x0,	    0x0,     0x0,     0x0,     0x0,
     0x0,	 0x0,	  0x0,	   0x0,	    0x0,     0x0,     0x0,     0x0,
@@ -117,7 +117,7 @@ u_short holes[256] = {
     0x202,	 0x201,	  0x082,   0x806,   0x822,   0x600,   0x282,   0x0
 };
 
-void printcard(char *);
+static void printcard(char *);
 
 /*
  * i'th bit of w.
@@ -148,7 +148,7 @@ main(int argc, char **argv)
 
 #define	COLUMNS	48
 
-void
+static void
 printcard(char *str)
 {
 	static char rowchars[] = "   123456789";

games/caesar/caesar.c

@@ -67,13 +67,13 @@ __FBSDID("$FreeBSD$");
  * letter frequencies (taken from some unix(tm) documentation)
  * (unix is a trademark of Bell Laboratories)
  */
-double stdf[26] = {
+static double stdf[26] = {
 	7.97, 1.35, 3.61, 4.78, 12.37, 2.01, 1.46, 4.49, 6.39, 0.04,
 	0.42, 3.81, 2.69, 5.92,  6.96, 2.91, 0.08, 6.63, 8.77, 9.68,
 	2.62, 0.81, 1.88, 0.23,  2.07, 0.06,
 };
 
-void printit(char *);
+static void printit(char *);
 
 int
 main(int argc, char **argv)
@@ -147,7 +147,7 @@ main(int argc, char **argv)
 	exit(0);
 }
 
-void
+static void
 printit(char *arg)
 {
 	int ch, rot;