fix [3127755] Launcher is missing anti-aliasing

Enable limited forms of mipmaping when possible.

Change-Id: I39ad90becaa4048844fdbbbcb187333e7d59fc6a
diff --git a/libs/rs/rsContext.cpp b/libs/rs/rsContext.cpp
index 92c6619..90a2c79 100644
--- a/libs/rs/rsContext.cpp
+++ b/libs/rs/rsContext.cpp
@@ -572,6 +572,7 @@
             glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_VECTORS, &mGL.mMaxFragmentUniformVectors);
 
             mGL.OES_texture_npot = NULL != strstr((const char *)mGL.mExtensions, "GL_OES_texture_npot");
+            mGL.GL_IMG_texture_npot = NULL != strstr((const char *)mGL.mExtensions, "GL_IMG_texture_npot");
         }
 
     }