Remove c test and make Fortran test not require windows

Author: DavidTruby

clang/test/Driver/flang/msvc-link.f90

@@ -1,8 +1,5 @@
-! REQUIRES: system-windows
+! RUN: %clang --driver-mode=flang -target x86_64-pc-windows-msvc -### %s -Ltest 2>&1 | FileCheck %s
 !
-! RUN: %clang --driver-mode=flang -### %s -Ltest 2>&1 | FileCheck %s
-!
-! Test that user provided paths come before the Flang runtimes and compiler-rt
+! Test that user provided paths come before the Flang runtimes
 ! CHECK: "-libpath:test"
-! CHECK: "-libpath:{{.*}}\\lib"
-! CHECK: "-libpath:{{.*}}\\lib\\clang\\{{[0-9]+}}\\lib\\windows"
+! CHECK: "-libpath:{{.*(\\|/)}}lib"