[flang-x86_64-windows] Add compiler-rt

On Windows, compiler-rt is required to provide LLVM-emitted functions
that Microsoft's crt does not provide.

Otherwise, this is the error:

flang_rt.runtime.dynamic.lib(binary-to-decimal.cpp.obj) : error LNK2019: unresolved external symbol __udivti3 referenced in function "public: __cdecl Fortran::decimal::BigRadixFloatingPointNumber<64,16>::BigRadixFloatingPointNumber<64,16>(class Fortran::decimal::BinaryFloatingPointNumber<64>,enum Fortran::decimal::FortranRounding)" (??0?$BigRadixFloatingPointNumber@$0EA@$0BA@@decimal@Fortran@@qeaa@V?$BinaryFloatingPointNumber@$0EA@@12@W4FortranRounding@12@@z)
flang-rt\unittests\Evaluate\reshape.test.exe : fatal error LNK1120: 1 unresolved externals

Author: Meinersbur

buildbot/osuosl/master/config/builders.py

@@ -2527,7 +2527,7 @@
     'workernames' : ["minipc-ryzen-win"],
     'builddir': "flang-x86_64-windows",
     'factory' : UnifiedTreeBuilder.getCmakeWithNinjaBuildFactory(
-                    depends_on_projects=['llvm','mlir','clang','flang','flang-rt'],
+                    depends_on_projects=['llvm','mlir','clang','compiler-rt','flang','flang-rt'],
                     checks=['check-flang','check-flang-rt'],
                     install_dir="flang.install",
                     extra_configure_args=[