Move includes to the top of the file.

include/missing.h

@@ -22,6 +22,9 @@
 #ifndef _SUDO_MISSING_H
 #define _SUDO_MISSING_H
 
+#include <stdio.h>
+#include <stdarg.h>
+
 /*
  * Macros and functions that may be missing on some operating systems.
  */
@@ -261,9 +264,6 @@ void setprogname(const char *);
 #  endif
 #endif /* HAVE_SETEUID */
 
-#include <stdio.h>
-#include <stdarg.h>
-
 /* Functions "missing" from libc. */
 
 struct timeval;