CMake warnings

[rossburton]

During configure with cmake 3.12.1:

CMake Warning (dev) at CMakeLists.txt:26 (set):
  Cannot set "NTIRPC_VERSION_EMBED": current scope has no parent.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at CMakeLists.txt:27 (set):
  Cannot set "NTIRPC_ABI_EMBED": current scope has no parent.
This warning is for project developers.  Use -Wno-dev to suppress it.

[dang]

Yeah, this is a known issue. It's a side effect of the work to make ntirpc build both alone and as a sub-module of Ganesha.

[ffilz]

I think we can close this.