Remove unnecessary casts
Remove unnecessary casts

SLEPc has been const-correct here since at least 2011; I didn't have
any older versions around to check.

hrittich/libmesh,jwpeterson/libmesh,dschwen/libmesh,libMesh/libmesh,pbauman/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,90jrong/libmesh,libMesh/libmesh,BalticPinguin/libmesh,dschwen/libmesh,pbauman/libmesh,giorgiobornia/libmesh,libMesh/libmesh,jwpeterson/libmesh,dschwen/libmesh,BalticPinguin/libmesh,hrittich/libmesh,hrittich/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,roystgnr/libmesh,dschwen/libmesh,90jrong/libmesh,dschwen/libmesh,libMesh/libmesh,pbauman/libmesh,libMesh/libmesh,roystgnr/libmesh,roystgnr/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,90jrong/libmesh,pbauman/libmesh,giorgiobornia/libmesh,hrittich/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,pbauman/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,hrittich/libmesh,libMesh/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,pbauman/libmesh,pbauman/libmesh,90jrong/libmesh,BalticPinguin/libmesh,libMesh/libmesh,90jrong/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,90jrong/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,90jrong/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,90jrong/libmesh,roystgnr/libmesh,capitalaslash/libmesh,pbauman/libmesh,capitalaslash/libmesh,giorgiobornia/libmesh,hrittich/libmesh,hrittich/libmesh,90jrong/libmesh,roystgnr/libmesh,pbauman/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,dschwen/libmesh,hrittich/libmesh,hrittich/libmesh,jwpeterson/libmesh,capitalaslash/libmesh