New uploader for linux with makefile changes to generate library + command line util.

client/linux/handler/exception_handler.cc

Index: client/linux/handler/exception_handler.cc
===================================================================
--- client/linux/handler/exception_handler.cc	(revision 399)
+++ client/linux/handler/exception_handler.cc	(working copy)
@@ -88,6 +88,7 @@
 // A wrapper for the tgkill syscall: send a signal to a specific thread.
 static int tgkill(pid_t tgid, pid_t tid, int sig) {
   syscall(__NR_tgkill, tgid, tid, sig);
+  return 0;
 }
 
 namespace google_breakpad {
@@ -171,6 +172,7 @@
       return false;
     old_handlers_.push_back(std::make_pair(kExceptionSignals[i], old));
   }
+  return true;
 }
 
 // Runs before crashing: normal context.