Mac: Fix back trace to work under OS > 10.5

svn path=/trunk/boinc/; revision=25286

checkin_notes

@@ -1851,3 +1851,11 @@ David  17 Feb 2012
     vda/
         Makefile.am new
         makefile (renamed to makefile_orig)
+
+Charlie 17 Feb 2012
+    - Mac: Fix back trace to work under OS > 10.5.
+    (Checked in to boinc_core_release_7_0_16 tag)
+    
+    lib/
+        mac/
+            mac_backtrace.cpp

lib/mac/mac_backtrace.cpp

@@ -156,7 +156,7 @@ void PrintBacktrace(void) {
     
     err = QCRCreateFromSelf(&crRef);
 
-    if (OSMinorVersion == '5') {
+    if (OSMinorVersion >= '5') {
 #ifdef __ppc__
         fputs("BOINC backtrace under OS 10.5.x only shows exported (global) symbols\n", stderr);
         fputs("and may work poorly on a PowerPC Mac after a crash.  For a better\n", stderr);