ir_to_mesa: Convert this code to using linker.cpp's uniform locations.

Fixes: glsl-fs-uniform-array-4.
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index cb06036..0348bd0 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -929,6 +929,7 @@
 	 n->slots = vec4_slots;
 
 	 n->u->Name = strdup(name);
+	 n->u->Type = type;
 	 n->u->VertPos = -1;
 	 n->u->FragPos = -1;
 	 n->u->GeomPos = -1;