rename census log files to avoid build breakage on MacOS
diff --git a/grpc.gemspec b/grpc.gemspec
index 061b0f2..ae8cfaf 100755
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -283,7 +283,7 @@
   s.files += %w( src/core/tsi/transport_security.h )
   s.files += %w( src/core/tsi/transport_security_interface.h )
   s.files += %w( src/core/census/aggregation.h )
-  s.files += %w( src/core/census/log.h )
+  s.files += %w( src/core/census/mlog.h )
   s.files += %w( src/core/census/rpc_metric_id.h )
   s.files += %w( src/core/census/grpc_context.c )
   s.files += %w( src/core/census/grpc_filter.c )
@@ -436,7 +436,7 @@
   s.files += %w( src/core/tsi/transport_security.c )
   s.files += %w( src/core/census/context.c )
   s.files += %w( src/core/census/initialize.c )
-  s.files += %w( src/core/census/log.c )
+  s.files += %w( src/core/census/mlog.c )
   s.files += %w( src/core/census/operation.c )
   s.files += %w( src/core/census/placeholders.c )
   s.files += %w( src/core/census/tracing.c )