OptionalInstall: try to fix multi configuration dashboard failure
Merge topic 'optional-install' into next

2950cc5 OptionalInstall: try to fix multi configuration dashboard failure
InstallRules: added new variable to disable generation of install rules

The boolean variable CMAKE_SKIP_INSTALL_RULES
allows disabling generation of install rules for projects which don't
want them.
Merge topic 'optional-install' into next

ea60e09 InstallRules: added new variable to disable generation of install rules