Minor - remove extra include from apm.c.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/src/apm.c b/src/apm.c
index 54696e9..8daf958 100644
--- a/src/apm.c
+++ b/src/apm.c
@@ -6,7 +6,6 @@
 //
 // This file may be distributed under the terms of the GNU LGPLv3 license.
 
-#include "farptr.h" // GET_VAR
 #include "bregs.h" // struct bregs
 #include "ioport.h" // outb
 #include "util.h" // dprintf