fix compilation
References: https://github.com/facebook/hhvm/issues/168 . Same issue occurs in Gentoo with gcc 9.1
Signed-off-by: David Heidelberg david@ixit.cz
References: https://github.com/facebook/hhvm/issues/168 . Same issue occurs in Gentoo with gcc 9.1
Signed-off-by: David Heidelberg david@ixit.cz