Rollup merge of #122270 - onur-ozkan:fix-rmake-test-with-rpath-false, r=Mark-Simulacrum

fix `long-linker-command-lines` failure caused by `rust.rpath=false`

Fixes `long-linker-command-lines` test failure (which happens when `rust.rpath` is set to `false`) by adjusting `LD_LIBRARY_PATH`.

Fixes #90921

Author: fmease

tests/run-make/long-linker-command-lines/Makefile

@@ -1,6 +1,8 @@
 # ignore-cross-compile
 include ../tools.mk
 
+export LD_LIBRARY_PATH := $(HOST_RPATH_DIR)
+
 all:
 	$(RUSTC) foo.rs -g -O
 	RUSTC="$(RUSTC_ORIGINAL)" $(call RUN,foo)