Replace VLA with thread local vectors

CMakeLists.txt

@@ -88,27 +88,6 @@ FetchContent_MakeAvailable(llhttp)
 
 include_directories(src)
 
-# Check for VLA (Variable Length Array) support
-include(CheckCXXSourceCompiles)
-check_cxx_source_compiles(
-  "
-int main() {
-  int n = 10;
-  char arr[n];
-  return 0;
-}
-"
-  HAVE_VLA_SUPPORT)
-
-if(NOT HAVE_VLA_SUPPORT)
-  message(
-    FATAL_ERROR
-      "Compiler must support Variable Length Arrays (VLA). Please use GCC or Clang."
-  )
-endif()
-
-message(STATUS "Compiler supports Variable Length Arrays")
-
 find_package(weaseljson REQUIRED)
 
 # Generate JSON token hash table using gperf