trace-cmd: Make the GUI targets buildable out-of-tree

This patch allows the GUI targets to be buildable out-of-tree when the 'O'
variable is set at command line while invoking make.

With this final patch, the out-of-tree build of all targets works.

Signed-off-by: Vladislav Valtchev (VMware) <vladislav.valtchev@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2 files changed