fix missing export

Author: Arthapz

src/pugixml.cppm

@@ -60,7 +60,6 @@ export module pugixml;
 import std.compat;
 #endif
 
-#define PUGIXML_MODULE_EXPORT export
 #if defined(__clang__)
 #	pragma clang diagnostic push
 #	pragma clang diagnostic ignored "-Winclude-angled-in-module-purview"
@@ -69,7 +68,7 @@ import std.compat;
 #	pragma warning(disable:5244)
 #endif
 #if !defined(PUGIXML_HEADER_ONLY)
-extern "C++" {
+export extern "C++" {
 #endif
 #include <pugixml.hpp>
 #if !defined(PUGIXML_HEADER_ONLY)