CMake: Bump cmake version

Bump cmake version to 3.5 to avoid this ugly message:
```
CMake Deprecation Warning at CMakeLists.txt:15 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.
```

CMakeLists.txt

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 
 # Enable CMake policies
 
@@ -43,12 +43,6 @@ if (APPLE)
     endif()
 endif()
 
-# Until CMake 3.4.0 FindThreads.cmake requires C language enabled.
-# Enable C language before CXX to avoid possible override of CMAKE_SIZEOF_VOID_P.
-if (CMAKE_VERSION VERSION_LESS 3.4)
-    enable_language(C)
-endif()
-
 file(READ include/oneapi/tbb/version.h _tbb_version_info)
 string(REGEX REPLACE ".*#define TBB_VERSION_MAJOR ([0-9]+).*" "\\1" _tbb_ver_major "${_tbb_version_info}")
 string(REGEX REPLACE ".*#define TBB_VERSION_MINOR ([0-9]+).*" "\\1" _tbb_ver_minor "${_tbb_version_info}")