move vector math out of libui

created a new header-only static libmath lib

Test: built & ran
Bug: n/a
Change-Id: Ic63ef5f54d9a0de07a9ab9e4d67be01ab6169fc0
diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.h b/services/surfaceflinger/RenderEngine/RenderEngine.h
index 0259881..d19137b 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.h
@@ -23,7 +23,7 @@
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
-#include <ui/mat4.h>
+#include <math/mat4.h>
 #include <Transform.h>
 
 #define EGL_NO_CONFIG ((EGLConfig)0)