InstallRules: removed spurious newline
Merge topic 'optional-install' into next

1390c5a InstallRules: removed spurious newline
InstallRules: added new variable to disable generation of install rules

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

55c6e3a InstallRules: added new variable to disable generation of install rules