broadcom/vc4: add path to nir_builder.h

As the other VC4 files do. Otherwise, it won't find nir_builder.h

v2: add path in source code rather changing autotools (Emil)

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/gallium/drivers/vc4/vc4_blit.c

@@ -24,7 +24,7 @@
 #include "util/u_format.h"
 #include "util/u_surface.h"
 #include "util/u_blitter.h"
-#include "nir_builder.h"
+#include "compiler/nir/nir_builder.h"
 #include "vc4_context.h"
 
 static struct pipe_surface *