gccrs: Continue to replace usages of Location with location_t

gccrs: Continue to replace usages of Location with location_t

gcc/rust/ChangeLog:

	* backend/rust-compile-base.cc: Replace Location with location_t.
	* backend/rust-compile-base.h: Likewise.
	* backend/rust-compile-expr.cc: Likewise.
	* lex/rust-token.h: Likewise.
	* metadata/rust-import-archive.cc: Likewise.
	* metadata/rust-imports.cc: Likewise.
	* metadata/rust-imports.h: Likewise.
	* rust-backend.h: Likewise.
	* rust-diagnostics.cc: Likewise.
	* rust-diagnostics.h: Likewise.
	* rust-gcc.cc: Likewise.
	* rust-linemap.cc: Likewise.
	* util/rust-token-converter.cc: Likewise.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>