[libsoup] Fix the DDL cross-compile build. Missing `extern`.

[Patrick Griffis <pgriffis src gnome org>]

commit 7c8272813f1dac68804f7d21cec47bf91a641c18
Author: Melroy van den Berg <webmaster1989 gmail com>
Date:   Mon Dec 6 19:49:13 2021 +0000

    Fix the DDL cross-compile build. Missing `extern`.

 libsoup/soup-version.h.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libsoup/soup-version.h.in b/libsoup/soup-version.h.in
index f43d4862..557bf95f 100644
--- a/libsoup/soup-version.h.in
+++ b/libsoup/soup-version.h.in
@@ -32,7 +32,7 @@ G_BEGIN_DECLS
 #  ifdef G_PLATFORM_WIN32
 #    ifdef LIBSOUP_COMPILATION
 #      ifdef DLL_EXPORT
-#        define SOUP_VAR __declspec(dllexport)
+#        define SOUP_VAR extern __declspec(dllexport)
 #      else /* !DLL_EXPORT */
 #        define SOUP_VAR extern
 #      endif /* !DLL_EXPORT */