Fix framworks/base compiling against musl

Add missing includes that are not transitively provided when compiling
against musl.

Bug: 190084016
Test: m USE_HOST_MUSL=true
Change-Id: Ia22c3df2e904e7a479bb636b7db22e5a0c341b98
diff --git a/tools/streaming_proto/Errors.cpp b/tools/streaming_proto/Errors.cpp
index 0cd9037..6890d99 100644
--- a/tools/streaming_proto/Errors.cpp
+++ b/tools/streaming_proto/Errors.cpp
@@ -1,5 +1,6 @@
 #include "Errors.h"
 
+#include <stdarg.h>
 #include <stdlib.h>
 
 namespace android {