Move rust-buffered-queue.h to util folder #1766

gcc/rust/ChangeLog:

	* rust-buffered-queue.h: Moved to...
	* util/rust-buffered-queue.h: ...here.

Signed-off-by: Muhammad Mahad <mahadtxt@gmail.com>

diff --git a/gcc/rust/rust-buffered-queue.h b/gcc/rust/util/rust-buffered-queue.h
similarity index 100%
rename from gcc/rust/rust-buffered-queue.h
rename to gcc/rust/util/rust-buffered-queue.h