you apparently have XFree86 4.3 and the fglrx driver meant for 4.3,
and there's already a libGL.so.1.2 installed.
I'd try "--force"ing the rpm install.
rpm --force -Uhv fglrx-4.3...etc....rpm
doesn't the fglrx installation instructions say something about this?
or am I mistakenly recalling seeing something about this in the ATI FAQs/Support?
enjoy!