Auto-detect ClangTidy from Homebrew in both llvm and llvm@<X> forms (#1653)

Fixes: #1652
Signed-off-by: Juan Cruz Viotti <[email protected]>

Author: jviotti

cmake/common/targets/clang-tidy.cmake

@@ -7,13 +7,13 @@ function(sourcemeta_target_clang_tidy)
   # given that the LLVM formula won't symlink `clang-tidy`
   # to any available path by default.
   if(APPLE)
-    if(IS_DIRECTORY "/opt/homebrew/Cellar/llvm")
-      set(HOMEBREW_LLVM "/opt/homebrew/Cellar/llvm")
-    elseif(IS_DIRECTORY "/usr/local/Cellar/llvm")
-      set(HOMEBREW_LLVM "/opt/local/Cellar/llvm")
+    if(IS_DIRECTORY "/opt/homebrew/Cellar")
+      set(HOMEBREW_CELLAR "/opt/homebrew/Cellar")
+    elseif(IS_DIRECTORY "/usr/local/Cellar")
+      set(HOMEBREW_CELLAR "/opt/local/Cellar")
     endif()
-    if(HOMEBREW_LLVM)
-      file(GLOB llvm_version_paths LIST_DIRECTORIES true "${HOMEBREW_LLVM}/*")
+    if(HOMEBREW_CELLAR)
+      file(GLOB llvm_version_paths LIST_DIRECTORIES true "${HOMEBREW_CELLAR}/llvm*/*")
       foreach(llvm_version_path ${llvm_version_paths})
         list(APPEND CLANG_TIDY_FIND_PATHS "${llvm_version_path}/bin")
       endforeach()