[gtkmm/fix.exports.msvc: 2/2] expressionwatch.hg: Don't mark class ExpressionWatch

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

commit 7494aa656f4234aef1fff9ee9fe126f3ae3c3679
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Sat Jan 23 10:17:21 2021 +0800

    expressionwatch.hg: Don't mark class ExpressionWatch
    
    This is a templatized class that had its method implementations done in
    the headers directly, so don't mark it with GTKMM_API so that things
    will build on Visual Studio-style builds.

 gtk/src/expressionwatch.hg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/src/expressionwatch.hg b/gtk/src/expressionwatch.hg
index c727dd4b..b1fb9e66 100644
--- a/gtk/src/expressionwatch.hg
+++ b/gtk/src/expressionwatch.hg
@@ -34,7 +34,7 @@ public:
 };
 
 template<class T>
-class GTKMM_API ExpressionWatch final : public ExpressionWatchBase
+class ExpressionWatch final : public ExpressionWatchBase
 {
 public:
   /** Evaluates the watched expression and on success returns the result.