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()"
"virtual Q_REQUIRED_RESULT foo bar()" -> "Q_REQUIRED_RESULT virtual foo bar()"
mentioned in commit b3bcc3d8
·mentioned in commit b3bcc3d8