Fix build with GCC 12 (more standard attributes in middle of decl-specifiers)

"virtual Q_REQUIRED_RESULT foo bar()" -> "Q_REQUIRED_RESULT virtual foo bar()"

(cherry picked from commit ee41cef0)

plugins/messageviewer/bodypartformatter/markdown/markdownabstract.h

@@ -16,7 +16,7 @@ public:
 
     void setText(const QString &str);
 
-    virtual Q_REQUIRED_RESULT QString toHtml() const = 0;
+    Q_REQUIRED_RESULT virtual QString toHtml() const = 0;
 
 protected:
     QString mText;

plugins/webengineurlinterceptor/adblock/lib/adblocksubscription.h

@@ -44,11 +44,11 @@ public:
     const AdBlockRule *enableRule(int offset);
     const AdBlockRule *disableRule(int offset);
 
-    virtual Q_REQUIRED_RESULT bool canEditRules() const;
-    virtual Q_REQUIRED_RESULT bool canBeRemoved() const;
+    Q_REQUIRED_RESULT virtual bool canEditRules() const;
+    Q_REQUIRED_RESULT virtual bool canBeRemoved() const;
 
-    virtual Q_REQUIRED_RESULT int addRule(AdBlockRule *rule);
-    virtual Q_REQUIRED_RESULT bool removeRule(int offset);
+    Q_REQUIRED_RESULT virtual int addRule(AdBlockRule *rule);
+    Q_REQUIRED_RESULT virtual bool removeRule(int offset);
     virtual const AdBlockRule *replaceRule(AdBlockRule *rule, int offset);
 
     Q_REQUIRED_RESULT bool enabled() const;