$NetBSD: patch-CMakeLists.txt,v 1.4 2023/05/22 14:10:42 fcambus Exp $

Do not disable extensions, needs gnu++17 for alloca(3).

--- CMakeLists.txt.orig	2023-05-12 21:56:46.000000000 +0000
+++ CMakeLists.txt
@@ -167,7 +167,7 @@ else ()
     -Wall -Wextra -Wno-unused-parameter -Wpointer-arith -Wuninitialized -Wimplicit-fallthrough
   )
 
-  set(CMAKE_CXX_EXTENSIONS OFF)
+  set(CMAKE_CXX_EXTENSIONS ON)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wold-style-cast")
 
   if (NOT WITH_EXCEPTIONS)