$make xconfig generates this error on the last couple kernels: 
(2.6.14-git14, git13)

make xconfig
   HOSTCXX scripts/kconfig/qconf.o
   HOSTLD  scripts/kconfig/qconf
/usr/bin/ld: cannot find -l-ldl
collect2: ld returned 1 exit status
make[1]: *** [scripts/kconfig/qconf] Error 1
make: *** [xconfig] Error 2


The actual problem may be at another level, since I don't see a 
difference between the scripts/kconfig/Makefile & prior ones that work, 
but this patch seems in line with other targets that work and used the 
standard pkg-config --libs --cflags setup.

Signed-off-by: Mickey Stein <yekkim@pacbell.net>

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