Fix exception for older compilers.
Fix exception for older compilers.

Addresses this error:
../include/libmesh/libmesh_exceptions.h:119: error: looser throw specifier for virtual libMesh::SolverException::~SolverException()
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:63: error:   overriding virtual std::exception::~exception() throw ()

90jrong/libmesh,cahaynes/libmesh,coreymbryant/libmesh,svallaghe/libmesh,jwpeterson/libmesh,aeslaughter/libmesh,90jrong/libmesh,cahaynes/libmesh,vikramvgarg/libmesh,hrittich/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,coreymbryant/libmesh,libMesh/libmesh,giorgiobornia/libmesh,benkirk/libmesh,friedmud/libmesh,coreymbryant/libmesh,cahaynes/libmesh,jwpeterson/libmesh,permcody/libmesh,pbauman/libmesh,balborian/libmesh,benkirk/libmesh,libMesh/libmesh,friedmud/libmesh,pbauman/libmesh,giorgiobornia/libmesh,balborian/libmesh,hrittich/libmesh,aeslaughter/libmesh,dknez/libmesh,BalticPinguin/libmesh,dknez/libmesh,cahaynes/libmesh,coreymbryant/libmesh,roystgnr/libmesh,friedmud/libmesh,benkirk/libmesh,benkirk/libmesh,90jrong/libmesh,vikramvgarg/libmesh,coreymbryant/libmesh,libMesh/libmesh,friedmud/libmesh,hrittich/libmesh,svallaghe/libmesh,permcody/libmesh,dschwen/libmesh,dmcdougall/libmesh,90jrong/libmesh,svallaghe/libmesh,pbauman/libmesh,libMesh/libmesh,balborian/libmesh,aeslaughter/libmesh,capitalaslash/libmesh,pbauman/libmesh,jwpeterson/libmesh,benkirk/libmesh,aeslaughter/libmesh,capitalaslash/libmesh,permcody/libmesh,aeslaughter/libmesh,balborian/libmesh,pbauman/libmesh,dknez/libmesh,pbauman/libmesh,dknez/libmesh,friedmud/libmesh,dknez/libmesh,benkirk/libmesh,BalticPinguin/libmesh,dknez/libmesh,90jrong/libmesh,90jrong/libmesh,friedmud/libmesh,capitalaslash/libmesh,90jrong/libmesh,dknez/libmesh,libMesh/libmesh,friedmud/libmesh,90jrong/libmesh,balborian/libmesh,roystgnr/libmesh,vikramvgarg/libmesh,permcody/libmesh,pbauman/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,balborian/libmesh,roystgnr/libmesh,jwpeterson/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,dschwen/libmesh,benkirk/libmesh,coreymbryant/libmesh,dmcdougall/libmesh,giorgiobornia/libmesh,permcody/libmesh,cahaynes/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,cahaynes/libmesh,giorgiobornia/libmesh,90jrong/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,jwpeterson/libmesh,aeslaughter/libmesh,hrittich/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,cahaynes/libmesh,BalticPinguin/libmesh,benkirk/libmesh,hrittich/libmesh,dmcdougall/libmesh,hrittich/libmesh,vikramvgarg/libmesh,dmcdougall/libmesh,BalticPinguin/libmesh,balborian/libmesh,libMesh/libmesh,aeslaughter/libmesh,dmcdougall/libmesh,cahaynes/libmesh,coreymbryant/libmesh,vikramvgarg/libmesh,hrittich/libmesh,aeslaughter/libmesh,capitalaslash/libmesh,giorgiobornia/libmesh,aeslaughter/libmesh,BalticPinguin/libmesh,pbauman/libmesh,roystgnr/libmesh,coreymbryant/libmesh,dmcdougall/libmesh,dschwen/libmesh,svallaghe/libmesh,dmcdougall/libmesh,capitalaslash/libmesh,svallaghe/libmesh,friedmud/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,hrittich/libmesh,hrittich/libmesh,capitalaslash/libmesh,balborian/libmesh,BalticPinguin/libmesh,libMesh/libmesh,dschwen/libmesh,svallaghe/libmesh,permcody/libmesh,pbauman/libmesh,svallaghe/libmesh,dknez/libmesh,capitalaslash/libmesh,balborian/libmesh,giorgiobornia/libmesh,svallaghe/libmesh,roystgnr/libmesh,friedmud/libmesh,vikramvgarg/libmesh,vikramvgarg/libmesh,dschwen/libmesh,svallaghe/libmesh,balborian/libmesh,benkirk/libmesh,permcody/libmesh,dmcdougall/libmesh,dschwen/libmesh,permcody/libmesh