libtracefs: Make it possible to set libdir,includedir and mandir from outside

When building in build frameworks such as openembedded it is desired
to use the defintion of directories from the build framework.

Link: https://lore.kernel.org/linux-trace-devel/20221101111143.191772-1-peter@berginkonsult.se

Signed-off-by: Peter Bergin <peter@berginkonsult.se>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
1 file changed