gdb: use the PKGVERSION and BUGURL options

This patch makes gdb benefit from the TOOLCHAIN_PKGVERSION and
TOOLCHAIN_BUGURL options.

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>

reporter_name="dsreed on freenode/#crosstool-ng"

reporter_url=""

reporter_comment="Enables experimental support for VFP/NEON hardware floating point."