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cmd/cal: incldue header files

--- a/cmd/cal.c

+++ b/cmd/cal.c

@@ -1,3 +1,9 @@

+#include <u.h>

+#include <libc.h>

+

+#include <mem.h>

+#include <ps2.h>

+

 char*

 somegetline(int n)

 {

@@ -13,7 +19,7 @@

   {

     c = ps2_getc();

     // you may, or may not require the following

-    vga_putc(c); 

+    printf("%c", c); 

     if(c == '\r' || c == '\n')

     {