lame: unconditionally disable debug handling

lame: unconditionally disable debug handling

As it is also broken on arc, bfin and microblaze and brings very limited
added value.

Fixes:
http://autobuild.buildroot.net/results/643/643d174836457237615b6504e28d7b3c12a37f93/
http://autobuild.buildroot.net/results/831/831f3a03321cea1b753f3e7dd8d3c6354d51d3e7/
http://autobuild.buildroot.net/results/71d/71dc37f9cc56f3f53676f54bf28f2ca101bc4505/
http://autobuild.buildroot.net/results/61f/61f1e956bb433aa80f859b3cf37d374feee1cb0c/

And many more.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>