added SPAI_LIB in case PETSc is built with SPAI support
added SPAI_LIB in case PETSc is built with SPAI support


git-svn-id: ffc1bc5b3feaf8644044862cc38c386ade156493@2165 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh