Use the ptrdiff_t printf format code for backtracing on FreeBSD.

Patch by: me

(cherry picked from commit e0e462a3)

Change-Id: I1c59b2b631dbfd508d85abb774f27187ded47c17

sal/osl/unx/backtrace.c

@@ -17,6 +17,8 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include "sal/types.h"
+
 #ifdef SOLARIS
 
 #include <dlfcn.h>
@@ -177,20 +179,12 @@ void backtrace_symbols_fd( void **buffer, int size, int fd )
                 if ( dli.dli_fname && dli.dli_fbase )
                 {
                     offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
-#if defined X86_64
-                    fprintf( fp, "%s+0x%lx", dli.dli_fname, offset );
-#else
-                    fprintf( fp, "%s+0x%x", dli.dli_fname, offset );
-#endif
+                    fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
                 }
                 if ( dli.dli_sname && dli.dli_saddr )
                 {
                     offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
-#if defined X86_64
-                    fprintf( fp, "(%s+0x%lx)", dli.dli_sname, offset );
-#else
-                    fprintf( fp, "(%s+0x%x)", dli.dli_sname, offset );
-#endif
+                    fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
                 }
             }
             fprintf( fp, "[0x%p]\n", *pFramePtr );