[gpm]Make install errors

[Alessandro Rubini]

> if test "xlibgpm.so.-1.20.0" != "x" ; then \
>  /bin/install -c -m 644 libgpm.so.-1.20.0 /usr/lib/libgpm.so.-1.20.0 ;\
>  cd /usr/lib && ln -s -f libgpm.so.-1.20.0 libgpm.so ;\
>  # LDCONFIG is removed. Why ? make install should be possible as normal
> /bin/sh: -c: line 2: syntax error: unexpected end of file

Crearly a missing "fi". The new comment needs a "\" at the end as well.

Also, note the extra "-" that should not be there

/alessandro, not a user of 1.20