[clang-tidy] Use ; as separator for HeaderFileExtensions

... and deprecate use of ',' for the same.

https://reviews.llvm.org/D75621
diff --git a/clang-tools-extra/clang-tidy/bugprone/DynamicStaticInitializersCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/DynamicStaticInitializersCheck.cpp
index 7403762..d4d3ff9 100644
--- a/clang-tools-extra/clang-tidy/bugprone/DynamicStaticInitializersCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/DynamicStaticInitializersCheck.cpp
@@ -32,7 +32,8 @@
       RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
         "HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
   if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
-                                  HeaderFileExtensions, ',')) {
+                                  HeaderFileExtensions,
+                                  utils::defaultFileExtensionDelimiters())) {
     llvm::errs() << "Invalid header file extension: "
                  << RawStringHeaderFileExtensions << "\n";
   }