moved /WX flag inside 'NOT CIVETWEB_ALLOW_WARNINGS' block

CMakeLists.txt

@@ -307,8 +307,8 @@ if (MINGW)
 endif()
 if (NOT CIVETWEB_ALLOW_WARNINGS)
   add_c_compiler_flag(-Werror)
+  add_c_compiler_flag(/WX)
 endif()
-add_c_compiler_flag(/WX)
 add_c_compiler_flag(-pedantic-errors)
 add_c_compiler_flag(-fvisibility=hidden)
 add_c_compiler_flag(-fstack-protector-strong RELEASE)
@@ -376,8 +376,8 @@ if (CIVETWEB_ENABLE_CXX)
   endif()
   if (NOT CIVETWEB_ALLOW_WARNINGS)
     add_cxx_compiler_flag(-Werror)
+    add_cxx_compiler_flag(/WX)
   endif()
-  add_cxx_compiler_flag(/WX)
   add_cxx_compiler_flag(-pedantic-errors)
   add_cxx_compiler_flag(-fvisibility=hidden)
   add_cxx_compiler_flag(-fstack-protector-strong RELEASE)