install with shared libs doesn't create libGKlib.so

[cwsmith]

Running the following commands:

git clone https://github.com/KarypisLab/GKlib.git
cd GKlib
make config prefix=$PWD/install shared=1
make install

places the following files in the install lib dir:

-rw-r--r-- 1 root root 309624 Jul 24 17:06 libGKlib.so.0.0.1
lrwxrwxrwx 1 root root     17 Jul 24 17:06 libGKlib.so.0 -> libGKlib.so.0.0.1
drwxr-xr-x 6 root root   4096 Jul 24 17:06 ..
drwxr-xr-x 3 root root   4096 Jul 24 17:06 cmake
drwxr-xr-x 3 root root   4096 Jul 24 17:06 .

but not a libGKlib.so that the linker (ld) will find when building against shared libs.