Add option to compile with glog

Adding option to choose between glog and protobuf logger

Change-Id: I596fdde57b82f63f055dc3010a085a321808ea29
diff --git a/client.cc b/client.cc
index 8543e0d..db47b9c 100644
--- a/client.cc
+++ b/client.cc
@@ -16,10 +16,10 @@
 
 #include <stdint.h>
 
-#include <google/protobuf/stubs/logging.h>
 #include <openssl/curve25519.h>
 
 #include "client.h"
+#include "logging.h"
 
 namespace roughtime {
 
@@ -32,10 +32,10 @@
   uint8_t* padding;
 
   static_assert(kTagNONC < kTagPAD, "Tags must be written in order");
-  GOOGLE_CHECK(query.AddTagData(kTagNONC, nonce, kNonceLength) &&
+  ROUGHTIME_CHECK(query.AddTagData(kTagNONC, nonce, kNonceLength) &&
                query.AddTag(&padding, kTagPAD, kPaddingLen) &&
                query.Finish(&query_len));
-  GOOGLE_CHECK_EQ(query_len, sizeof(query_bytes));
+  ROUGHTIME_CHECK_EQ(query_len, sizeof(query_bytes));
 
   memset(padding, 0, kPaddingLen);