gdb: rename svr4_same_1 -> svr4_same_name

This makes it a bit clearer that it compares shared libraries by name.

While at it, change the return type to bool.

Change-Id: Ib11a931a0cd2e00bf6ae35c5b6e0d620298d46cb
Reviewed-By: Guinevere Larsen <guinevere@redhat.com>