Remove unecessary exported symbols from libhwui.so

Test: compiles and links
Bug: 150782769
Change-Id: Ib49c1bf914b6bfaad1fb29371115df7c9eec08d2
diff --git a/libs/hwui/Matrix.h b/libs/hwui/Matrix.h
index 0c515a4..4c6e1a0a 100644
--- a/libs/hwui/Matrix.h
+++ b/libs/hwui/Matrix.h
@@ -44,7 +44,7 @@
 // Classes
 ///////////////////////////////////////////////////////////////////////////////
 
-class ANDROID_API Matrix4 {
+class Matrix4 {
 public:
     float data[16];