gnu: Propagate suitesparse-* inputs referenced in header files.
* gnu/packages/maths.scm (suitesparse-amd, suitesparse-btf, suitesparse-camd,
suitesparse-colamd, suitesparse-ccolamd, gklib-suitesparse,
suitesparse-cholmod, suitesparse-cxsparse, suitesparse-klu, suitesparse-ldl,
suitesparse-rbio, suitesparse-mongoose, suitesparse-spex, suitesparse-spqr,
suitesparse-umfpack)[inputs]: Move relevant suitesparse-* packages ...
[propagated-inputs]: ... to here.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>