[flang-x86_64-windows] Run check-flang-rt

Forgotten out of #383, when enabling LLVM_ENABLE_RUNTIMES=flang-rt.

Author: Meinersbur

buildbot/osuosl/master/config/builders.py

@@ -2525,7 +2525,7 @@
     'builddir': "flang-x86_64-windows",
     'factory' : UnifiedTreeBuilder.getCmakeWithNinjaBuildFactory(
                     depends_on_projects=['llvm','mlir','clang','flang','flang-rt'],
-                    checks=['check-flang'],
+                    checks=['check-flang','check-flang-rt'],
                     install_dir="flang.install",
                     extra_configure_args=[
                         "-DCLANG_ENABLE_STATIC_ANALYZER=OFF",