debug/gdb: fix for psim build failure due to -lz in gdb-7.2.
Signed-off-by: "Horst Kronstorfer" <horst.kronstorfer@aon.at>
[yann.morin.1998@anciens.enib.fr: fix space-damage]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
1 reporter_name="Thomas Petazzoni"
2 reporter_url="http://www.free-electrons.com/"
3 reporter_comment="Very basic testing only"