Add documentation to tll.
ninja, OS X: fix regression handling frameworks

Fixing a regression in 373faae5.
Since the ninja file isn't aware of how framework symlinks work,
we suppress symlink creation and let cmOSXBundleGenerator handle it.
Also, use the real name of framework library in build rules as was done before,
instead of the symlink.
Merge topic 'rpath-on-mac' into next

9de56bc ninja, OS X: fix regression handling frameworks
Merge topic 'framework-interface-includes' into next

0da999e Add documentation to tll.