use the ape version of the header file.

Reference: /n/atom/patch/applied2013/apesecnit
Date: Wed May 29 20:13:01 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/ape/lib/sec/amd64/mkfile	Wed May 29 20:12:35 2013
+++ /sys/src/ape/lib/sec/amd64/mkfile	Wed May 29 20:12:35 2013
@@ -6,7 +6,7 @@
 	md5block\
 	sha1block\
 
-HFILES=/sys/include/libsec.h
+HFILES=/sys/include/ape/libsec.h
 
 SFILES=${FILES:%=%.s}