Revert "Revert "fix [2793164] Spam 2x/second with TOT master in SurfaceFlinger""

This reverts commit 330dd304a471d260a73e342a240921c03c825f99.
diff --git a/libs/surfaceflinger/Android.mk b/libs/surfaceflinger/Android.mk
index 0879a66..b0229c0 100644
--- a/libs/surfaceflinger/Android.mk
+++ b/libs/surfaceflinger/Android.mk
@@ -6,6 +6,7 @@
     DisplayHardware/DisplayHardware.cpp \
     DisplayHardware/DisplayHardwareBase.cpp \
     BlurFilter.cpp.arm \
+    GLExtensions.cpp \
     Layer.cpp \
     LayerBase.cpp \
     LayerBuffer.cpp \