[gjs/fix-windows] arg-cache.cpp: Drop constexpr for RegisteredType ctor

[Chun-wei Fan <fanchunwei src gnome org>]

commit 65273339041b541c13026a33ab2149062e36b92a
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Jan 12 16:54:43 2022 +0800

    arg-cache.cpp: Drop constexpr for RegisteredType ctor
    
    Apparently Visual Studio does not like the notion of this.  This will fix C3615
    compiler dianostic errors for this.

 gi/arg-cache.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gi/arg-cache.cpp b/gi/arg-cache.cpp
index dd25e16a..2fda580c 100644
--- a/gi/arg-cache.cpp
+++ b/gi/arg-cache.cpp
@@ -233,7 +233,7 @@ struct BaseInfo {
 
 // boxed / union / GObject
 struct RegisteredType {
-    constexpr RegisteredType(GType gtype, GIInfoType info_type)
+    RegisteredType(GType gtype, GIInfoType info_type)
         : m_gtype(gtype), m_info_type(info_type) {}
     explicit RegisteredType(GIBaseInfo* info)
         : m_gtype(g_registered_type_info_get_g_type(info)),