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>

reporter_name="unknown"

reporter_url="http://iphonelinux.org/index.php/Glibc_toolchain_using_crosstool-NG"

reporter_comment="An (experimental) toolchain targeting the Apple's iPhone."