Delete test/Prompt/ValuePrinter/FileSystemPath.C

Unfortunately the std::filesystem symbols are provided by the static
library libstdc++fs.a, which might be stripped out by the linker.

test/Prompt/ValuePrinter/FileSystemPath.C

@@ -1,24 +0,0 @@
-//------------------------------------------------------------------------------
-// CLING - the C++ LLVM-based InterpreterG :)
-//
-// This file is dual-licensed: you can choose to license it under the University
-// of Illinois Open Source License or the GNU Lesser General Public License. See
-// LICENSE.TXT for details.
-
-//------------------------------------------------------------------------------
-// RUN: cat %s | %cling | FileCheck %s
-
-#include <iostream>
-#if __cplusplus >= 201703L
-#include <filesystem>
-#endif
-
-#if __cplusplus >= 201703L
-auto p = std::filesystem::path("/some/path/foo.cpp");
-p
-#else
-// Hack to prevent failure if feature does not exist!
-std::cout << "(std::filesystem::path &)";
-std::cout << "/some/path/foo.cpp\n";
-#endif
-    // CHECK: (std::filesystem::path &) /some/path/foo.cpp