Revert "qi_install_header : check that first arg is a target"
Revert "qi_install_header : check that first arg is a target"

This reverts commit 36965ff388cd09f7fabe909b998e42f9dc6e2415.
not such a good idea ...

aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild