Simplify workaround for MSVC issue with XmlWriter

src/catch2/internal/catch_xmlwriter.cpp

@@ -5,9 +5,11 @@
 //        https://www.boost.org/LICENSE_1_0.txt)
 
 // SPDX-License-Identifier: BSL-1.0
-#include <catch2/internal/catch_xmlwriter.hpp>
-
+// Note: swapping these two includes around causes MSVC to error out
+//       while in /permissive- mode. No, I don't know why.
+//       Tested on VS 2019, 18.{3, 4}.x
 #include <catch2/internal/catch_enforce.hpp>
+#include <catch2/internal/catch_xmlwriter.hpp>
 
 #include <iomanip>
 #include <type_traits>

src/catch2/internal/catch_xmlwriter.hpp

@@ -10,13 +10,6 @@
 
 #include <catch2/internal/catch_stream.hpp>
 
-// FixMe: Without this include (and something inside it), MSVC goes crazy
-//        and reports that calls to XmlEncode's op << are ambiguous between
-//        the declaration and definition.
-//        It also has to be in the header.
-#include <catch2/internal/catch_source_line_info.hpp>
-
-
 #include <vector>
 
 namespace Catch {