[PATCH] Adding llvm-shlib to CMake build system with a few new bells and whistles

[NAKAMURA Takumi]

FYI, it should work also on mingw.

- binutils nm.exe is shipped by most mingw distros. You may assume nm.exe available also on mingw.
- It works if awk is available. I have gawk.exe in my msys tree.

I guess it would also work on msvc with a few tweaks.

I suggest to avoid awk|sort|sed. Could we use python here? Just only python is required to build the tree.
I will work for that.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5890