Make libc/${MACHINE_ARCH} include directory not required by Alpha.

Submitted by:	bde
Tested by:	beast

lib/libc_r/Makefile

@@ -11,7 +11,7 @@ LIB=c_r
 SHLIB_MAJOR= 5
 CFLAGS+=-DPTHREAD_KERNEL -D_THREAD_SAFE 
 CFLAGS+=-I${.CURDIR}/../libc/include -I${.CURDIR}/uthread \
-	-I${.CURDIR}/../../include -I${.CURDIR}/../libc/${MACHINE_ARCH}
+	-I${.CURDIR}/../../include
 
 # Uncomment this if you want libc_r to contain debug information for
 # thread locking.

lib/libc_r/arch/alpha/_atomic_lock.S

@@ -23,7 +23,7 @@
  *
  */
 
-#include "SYS.h"
+#include <machine/asm.h>
 
 /*
  * Atomicly lock a location with an identifier provided the location