Show build config in dumpsys SurfaceFlinger

This adds a line to the "dumpsys SurfaceFlinger" output that shows
build-time configuration values.

Example:
 Build configuration: [sf HAS_CONTEXT_PRIORITY] [libui] \
  [libgui USE_FENCE_SYNC]

Bug 7206633

Change-Id: Ibe1856b459d34a4be6ee83a4ebfd2807e6cc68a0
diff --git a/libs/ui/Android.mk b/libs/ui/Android.mk
index 80c28a1..0d2e44c 100644
--- a/libs/ui/Android.mk
+++ b/libs/ui/Android.mk
@@ -23,7 +23,8 @@
 	GraphicBufferMapper.cpp \
 	PixelFormat.cpp \
 	Rect.cpp \
-	Region.cpp
+	Region.cpp \
+	UiConfig.cpp
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \