gconfig: fix build failure on fedora 13

commit cbab05f0 upstream.

Making gconfig fails on fedora 13 as the linker cannot resolve dlsym.

Adding libdl to the link command fixes this.

make shows this error :-
    /usr/bin/ld: scripts/kconfig/kconfig_load.o: undefined reference to symbol 'dlsym@@GLIBC_2.2.5'
    /usr/bin/ld: note: 'dlsym@@GLIBC_2.2.5' is defined in DSO /lib64/libdl.so.2 so try adding it to the linker command line
    /lib64/libdl.so.2: could not read symbols: Invalid operation

tested on x86_64 fedora 13.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>