[BOLT][NFC] Using target_triple in lit config (#144078)

Author: paschalis-mpeis

bolt/test/lit.local.cfg

@@ -1,6 +1,11 @@
-host_linux_triple = config.target_triple.split("-")[0] + "-unknown-linux-gnu"
+host_triple = config.target_triple
+
+# Force triple on non-linux hosts to get ELF binaries on all platforms.
+if not "linux" in host_triple:
+  host_triple = host_triple.split("-")[0] + "-unknown-linux-gnu"
+
 common_linker_flags = "-fuse-ld=lld -Wl,--unresolved-symbols=ignore-all -Wl,--build-id=none -pie"
-flags = f"--target={host_linux_triple} -fPIE {common_linker_flags}"
+flags = f"--target={host_triple} -fPIE {common_linker_flags}"
 
 config.substitutions.insert(0, ("%cflags", f"%cflags {flags}"))
 config.substitutions.insert(0, ("%cxxflags", f"%cxxflags {flags}"))