Bump CMake minimum version, delete obsolete policy that's related to MacOS and
doesn't worry us
https://bugs.gentoo.org/951671
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 # setup directory where we should look for cmake files
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
--- a/src/catch/CMakeLists.txt
+++ b/src/catch/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.5)
 project(catch_builder CXX)
 include(ExternalProject)
 
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,11 +16,6 @@
 cmake_policy(SET CMP0007 NEW)
 cmake_policy(SET CMP0012 NEW)
 
-if (${CMAKE_MAJOR_VERSION} GREATER 2)
-    # old policy do not use MACOSX_RPATH
-    cmake_policy(SET CMP0042 OLD)
-endif()
-
 set(MAJOR_VERSION 1)
 set(MINOR_VERSION 4)
 set(PATCH_VERSION 0)