[mlir] Fix bazel after 59e74a0. (#160508)

Author: bartchr808

mlir/test/lit.site.cfg.py.in

@@ -60,7 +60,7 @@ config.mlir_run_cuda_sm80_tests = @MLIR_RUN_CUDA_SM80_TESTS@
 config.mlir_run_cuda_sm80_lt_tests = @MLIR_RUN_CUDA_SM80_LT_TESTS@
 config.mlir_run_cuda_sm90_tests = @MLIR_RUN_CUDA_SM90_TESTS@
 config.mlir_include_integration_tests = @MLIR_INCLUDE_INTEGRATION_TESTS@
-config.llvm_shared_libs_build = @BUILD_SHARED_LIBS@
+config.llvm_shared_libs_build = "@BUILD_SHARED_LIBS@"
 config.arm_emulator_executable = "@ARM_EMULATOR_EXECUTABLE@"
 # Some tests marked with 'UNSUPPORTED: target=aarch64{{.*}}' are still run when
 # configured with ARM_EMULATOR_EXECUTABLE and the default target is not aarch64.