More complete support for named attribs.  Adds user typed attribs as available to programVertex.  Non user attribs are not treated like user for GL2 for simplicity.
diff --git a/RenderScript.h b/RenderScript.h
index bb2c06a..6662333 100644
--- a/RenderScript.h
+++ b/RenderScript.h
@@ -64,6 +64,7 @@
 void rsContextDeinitToClient(RsContext);
 
 #define RS_MAX_TEXTURE 2
+#define RS_MAX_ATTRIBS 16
 
 enum RsDataType {
     RS_TYPE_NONE,