gallivm: Fix build with LLVM 3.3.

The setMCJITMemoryManager method doesn't exist in LLVM 3.3.

I thought I had tested the latest version of my earlier change with LLVM
3.3, but it looks I missed it.

Trivial.
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
index 776af47..6bc4d81 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+++ b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
@@ -493,11 +493,13 @@
 
    ShaderMemoryManager *MM;
    if (useMCJIT) {
+#if HAVE_LLVM > 0x0303
        BaseMemoryManager* JMM = reinterpret_cast<BaseMemoryManager*>(CMM);
        MM = new ShaderMemoryManager(JMM);
        *OutCode = MM->getGeneratedCode();
 
        builder.setMCJITMemoryManager(MM);
+#endif
    } else {
 #if HAVE_LLVM < 0x0306
        BaseMemoryManager* JMM = reinterpret_cast<BaseMemoryManager*>(CMM);