Fix linux sdk build.

This is a temporary patch until we update the prebuilt/ tree accordingly
to include libxcb.so for Linux.

Change-Id: I76d9966bfb73bf3f5ca35cc30f6e12fb262dc2b2
diff --git a/tools/emulator/opengl/tests/ut_renderer/Android.mk b/tools/emulator/opengl/tests/ut_renderer/Android.mk
index 1fe2d07..d48dec4 100644
--- a/tools/emulator/opengl/tests/ut_renderer/Android.mk
+++ b/tools/emulator/opengl/tests/ut_renderer/Android.mk
@@ -1,3 +1,9 @@
+# Building this module breaks the Linux build because
+# libxcb.so is not installed in the i686-linux-glibc2.7-4.4.3
+# prebuilt sysroot. Since rebuilding it will take some time, here's a
+# quick fix to unbreak it.
+#
+ifneq (,$(BUILD_EMULATOR_OPENGL))
 
 LOCAL_PATH:=$(call my-dir)
 
@@ -50,3 +56,5 @@
 include $(BUILD_HOST_EXECUTABLE)
 
 endif # HOST_OS == linux
+
+endif # BUILD_EMULATOR_OPENGL