Add ppc support to minidump reader (#27). r=bryner.

- Uses new MDRawContextPPC structure from #25.
 - Interface change: (MinidumpContext).context() replaced with
   GetContextCPU to determine CPU type and GetContextX86/GetContextPPC to
   get CPU-specific context.

http://groups.google.com/group/airbag-dev/browse_thread/thread/f6c2e9cab2832b4c


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@33 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/google/airbag_types.h

@@ -56,6 +56,10 @@ typedef unsigned __int64 u_int64_t;
 
 #endif /* !_WIN32 */
 
+typedef struct {
+  u_int64_t half[2];
+} u_int128_t;
+
 typedef u_int64_t airbag_time_t;
 
 #endif /* GOOGLE_AIRBAG_TYPES_H__ */