Fix cmake warnings with newer cmake

[sbalint98]

When using newer cmake (3.27.5) to build the repository as described in the How to install section, the following cmake warnings are displayed:

CMake Warning (dev) at CMakeLists.txt:45:
  Syntax Warning in cmake code at column 113

  Argument not separated from preceding token by whitespace.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at CMakeLists.txt:21 (project):
  cmake_minimum_required() should be called prior to this top-level project()
  call.  Please see the cmake-commands(7) manual for usage documentation of
  both commands.
This warning is for project developers.  Use -Wno-dev to suppress it.

This PR fixes these issues.

[iassiour]

Thank you for raising this. This has already been changed in the internal clr repo and this repo will soon be updated to reflect the change. Closing the PR.