[CMake] Add C as project language (#5217)

If you build with `-DTRITON_BUILD_UT=OFF` on Mac you will get something
like

```
-- Looking for histedit.h
CMake Error at /opt/homebrew/Cellar/cmake/3.30.5/share/cmake/Modules/CheckIncludeFile.cmake:90 (try_compile):
  Unknown extension ".c" for file
-- Looking for histedit.h - not found

    /Users/runner/work/triton/triton/triton-build/CMakeFiles/CMakeScratch/TryCompile-QA06d6/CheckIncludeFile.c

  try_compile() works only for enabled languages.  Currently these are:

    CXX

  See project() command to enable other languages.
Call Stack (most recent call first):
  llvm-bd9145c8-macos-arm64/lib/cmake/llvm/FindLibEdit.cmake:28 (check_include_file)
  llvm-bd9145c8-macos-arm64/lib/cmake/llvm/LLVMConfig.cmake:177 (find_package)
  llvm-bd9145c8-macos-arm64/lib/cmake/mlir/MLIRConfig.cmake:10 (find_package)
```

because `C` isn't an enabled project language.

Author: makslevental

CMakeLists.txt

@@ -12,7 +12,7 @@ set(CMAKE_CXX_STANDARD 17)
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
-project(triton CXX)
+project(triton CXX C)
 include(CTest)
 
 if(NOT WIN32)