fix makefile

Author: marcoieni

src/bootstrap/mk/Makefile.in

@@ -111,8 +111,8 @@ ci-msvc: ci-msvc-py ci-msvc-ps1
 # Set of tests that should represent half of the time of the test suite.
 # Used to split tests across multiple CI runners.
 TESTS_IN_MINGW_2 := \
-	tests/ui
-	src/tools/rust-analyzer
+	tests/ui \
+	src/tools/rust-analyzer \
 	src/tools/cargo
 
 # test both x and bootstrap entrypoints