[PECOFF] Support embedding resource file into executable.

Instead of making the linker to create a manifest XML file in the same
directory as the resulting binary, you can embed the XML as a part of
resource into the executable.

In order to do that, the linker first creates a resource script file containing
the XML file, compile it into a binary resource file with RC.EXE, and then
convert it to a COFF file with CVTRES.EXE.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193298 91177308-0d34-0410-b5e6-96231b3b80d8