backports: Fix menuconfig build

backports: Fix menuconfig build

Using openSUSE 12.3 with x86_64 architecture, the 'make menuconfig'
command results in the following:

finger@larrylap:~/backports-3.10-rc1-1> make menuconfig
cc -Wl,--no-as-needed -lncurses  mconf.o zconf.tab.o lxdialog/checklist.o lxdialog/inputbox.o lxdialog/menubox.o lxdialog/textbox.o lxdialog/util.o lxdialog/yesno.o   -o mconf
/usr/lib64/gcc/x86_64-suse-linux/4.7/../../../../x86_64-suse-linux/bin/ld: /lib64/libncurses.so.5: undefined reference to symbol 'acs_map'
/usr/lib64/gcc/x86_64-suse-linux/4.7/../../../../x86_64-suse-linux/bin/ld: note: 'acs_map' is defined in DSO /usr/lib64/gcc/x86_64-suse-linux/4.7/../../../../lib64/libtinfo.so so try adding it to the linker command line
/usr/lib64/gcc/x86_64-suse-linux/4.7/../../../../lib64/libtinfo.so: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make[2]: *** [mconf] Error 1
make[1]: *** [menuconfig] Error 2
make: *** [menuconfig] Error 2
finger@larrylap:~/backports-3.10-rc1-1>

When "-ltinfo" is added to the LDFLAGS symbol as suggested by the linker,
it builds and runs correctly.

1   2.6.24              [  OK  ]
2   2.6.25              [  OK  ]
3   2.6.26              [  OK  ]
4   2.6.27              [  OK  ]
5   2.6.28              [  OK  ]
6   2.6.29              [  OK  ]
7   2.6.30              [  OK  ]
8   2.6.31              [  OK  ]
9   2.6.32              [  OK  ]
10  2.6.33              [  OK  ]
11  2.6.34              [  OK  ]
12  2.6.35              [  OK  ]
13  2.6.36              [  OK  ]
14  2.6.37              [  OK  ]
15  2.6.38              [  OK  ]
16  2.6.39              [  OK  ]
17  3.0.76              [  OK  ]
18  3.1.10              [  OK  ]
19  3.2.44              [  OK  ]
20  3.3.8               [  OK  ]
21  3.4.43              [  OK  ]
22  3.5.7               [  OK  ]
23  3.6.11              [  OK  ]
24  3.7.10              [  OK  ]
25  3.8.11              [  OK  ]
26  3.9.0               [  OK  ]

real    17m9.368s
user    403m46.554s
sys     95m42.811s

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
[mcgrof: tested with ckmake]
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>