Fix compilation error :

Linking CXX executable ../../../../bin/constant_velocity_target
../../../../lib/libg2o_solver_cholmod.so: undefined reference to
`SuiteSparse_time'

By linking to the SuiteSparse library and especially adding linking to
libsuitesparseconfig
Merge pull request #27 from Skurlat/master

Fix compilation error : undefined reference to `SuiteSparse_time'