draw: Add inline keyword to inline function.

Otherwise gcc will warn about unusued functions.
diff --git a/src/gallium/auxiliary/draw/draw_llvm.h b/src/gallium/auxiliary/draw/draw_llvm.h
index c98d7fb..1ef009b 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.h
+++ b/src/gallium/auxiliary/draw/draw_llvm.h
@@ -193,7 +193,7 @@
    LLVMTypeRef vb_ptr_type;
 };
 
-static struct llvm_vertex_shader *
+static INLINE struct llvm_vertex_shader *
 llvm_vertex_shader(struct draw_vertex_shader *vs)
 {
    return (struct llvm_vertex_shader *)vs;