Remove legacy drawing functions.
Skip element names starting with '#'

Change-Id: I6b0967ed1dc47c072c3bed7c0219e2215a7068a6
diff --git a/rsVertexArray.cpp b/rsVertexArray.cpp
index 6f15db0..a13371a 100644
--- a/rsVertexArray.cpp
+++ b/rsVertexArray.cpp
@@ -123,6 +123,11 @@
     rsc->checkError("VertexArray::setupGL2 disabled");
     for (uint32_t ct=0; ct < mCount; ct++) {
         uint32_t slot = 0;
+
+        if (mAttribs[ct].name[0] == '#') {
+            continue;
+        }
+
         if (sc->isUserVertexProgram()) {
             slot = sc->vtxAttribSlot(ct);
         } else {