[magma] Add missing dep for linux build

Change-Id: I5d84aa2b22abd5ac4e79f53fcf5474731ac71682
diff --git a/garnet/lib/magma/src/magma_util/platform/linux/BUILD.gn b/garnet/lib/magma/src/magma_util/platform/linux/BUILD.gn
index a37431f..84fe19a 100644
--- a/garnet/lib/magma/src/magma_util/platform/linux/BUILD.gn
+++ b/garnet/lib/magma/src/magma_util/platform/linux/BUILD.gn
@@ -161,7 +161,10 @@
 
   sources = [ "linux_platform_port.cc" ]
 
-  deps = [ "..:port_header" ]
+  deps = [
+    "$magma_build_root/src/magma_util:macros",
+    "..:port_header",
+  ]
 }
 
 source_set("semaphore") {