I have a plan for you to clean the system from SMPlayer for good.
First We have to take care of compiled SM. SMPlayer supports DESTDIR as much as I know (Scriht from SBo uses it).
#make DESTDIR=$HOME/fake install
THis will install the SMPlayer as it is installed system wide.
#makepkg -l y -c n /tmp/smplayer-123-xi486-1_Compiled.tgz
this will create a package you can use to uninstall Compiled version. Use it as this:
after that removepkg packaged one.
now you should have a clean system from SMplayer.
of course Instead of creating package, you can use the $HOME/fake for manual delete. I'll do manual delete by hand. Anyway It's your system.