Fix build on MacOS Monterey (#1348)

Apparently, CMake no longer enables the "C" language by default for some users,
which we need to use some of our dependencies (like LibFFI).

Author: TimoWilken

CMakeLists.txt

@@ -13,7 +13,7 @@ cmake_minimum_required(VERSION 3.17 FATAL_ERROR)
 
 project(O2Physics
         VERSION 0.0.1
-        LANGUAGES CXX
+        LANGUAGES C CXX
         DESCRIPTION "Physics Analysis for O2")
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)