test.sh: temporarily stop testing leak sanitizer on Linux

It's broken since the upgrade to LLVM 8, see: rust-lang/rust#53945

test.sh

@@ -18,9 +18,12 @@ RUSTFLAGS="" ./test.sh
 version=`rustc --version`
 if [ -z "${version##*nightly*}" ] ;then
 	RUSTFLAGS="-Z sanitizer=address" ./test.sh
-	RUSTFLAGS="-Z sanitizer=thread" ./test.sh
-	if [ "`uname`" = "Linux" ] ;then # the leak sanitizer is only available on Linux
+	if [ "`uname`" = "Linux" ] ;then
+		# the leak sanitizer is only available on Linux
 		RUSTFLAGS="-Z sanitizer=leak" ./test.sh
+	else
+		# the thread sanitizer doesn't work anymore on Linux since the upgrade to LLVM 8, see: https://github.com/rust-lang/rust/issues/53945
+		RUSTFLAGS="-Z sanitizer=thread" ./test.sh
 	fi
 	# RUSTFLAGS="-Z sanitizer=memory" ./test.sh # not working, see: https://github.com/rust-lang/rust/issues/39610
 fi