Merge pull request #420 from drodriguez/fix-cmake-enable-language

Enable C language in CMakeList to avoid error finding LLVM

Author: stmontgomery

CMakeLists.txt

@@ -69,6 +69,7 @@ set_target_properties(XCTest PROPERTIES
 if(ENABLE_TESTING)
   enable_testing()
 
+  enable_language(C)
   find_package(LLVM CONFIG)
   if(LLVM_FOUND)
     message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")