FreeBSD PPC: Missing patch

Submitted by:	Curtis Hamilton

(cherry picked from commit 55ffac65)

Change-Id: I160ff9369a563d58469682ed96e25c792184708c

sal/osl/unx/backtrace.c

@@ -138,9 +138,18 @@ void backtrace_symbols_fd( void **buffer, int size, int fd )
 #include <stdio.h>
 #include "backtrace.h"
 
+#if defined(POWERPC) || defined(POWERPC64)
+
+#define FRAME_PTR_OFFSET 1
+#define FRAME_OFFSET     0
+
+#else
+
 #define FRAME_PTR_OFFSET 3
 #define FRAME_OFFSET 0
 
+#endif
+
 int backtrace( void **buffer, int max_frames )
 {
     struct frame *fp;