protozero: add dependency on src/base

This was causing linker errors after the new logging changes.

Change-Id: I580a4e0937d1054099b018ac59531991652b36f4
diff --git a/BUILD b/BUILD
index ed835ea..fc64217 100644
--- a/BUILD
+++ b/BUILD
@@ -101,6 +101,7 @@
 perfetto_cc_library(
     name = "libprotozero",
     srcs = [
+        ":src_base_base",
         ":src_protozero_protozero",
     ],
     hdrs = [