SWDEV-509213 - make cmake_minimum_required consistent across clr (#51)

Change-Id: Ib0b1df7af8984a37d6bf7ca68ec99597d5978821

rocclr/cmake/ROCclr.cmake

@@ -18,12 +18,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-cmake_minimum_required(VERSION 3.5)
-
-if (POLICY CMP0072)
-        cmake_policy(SET CMP0072 NEW)
-endif()
-
 # ROCclr abstracts the usage of multiple AMD compilers and runtimes.
 # It is possible to support multiple backends concurrently in the same binary.
 option(ROCCLR_ENABLE_HSAIL "Enable support for HSAIL compiler" OFF)