This change makes the install targets for lldb tools functional when
building for the framework.
I am currently working on the install rules for lldb-framework and this will
let me make install-lldb-framework rely on install-lldb-argdumper for
instance. This is especially important for install-lldb-framework-stripped. It
is much better for install-lldb-framework-stripped to rely on
install-lldb-argdumper-stripped than to copy and strip lldb-argdumper