src/sage/symbolic/expression.pyx: unlist deleted ginac/mpoly-giac.cpp

The source file sage/symbolic/ginac/mpoly-giac.cpp that integrates
GiNaC with giac was recently removed.

src/sage/symbolic/expression.pyx

@@ -1,4 +1,4 @@
-# distutils: sources = sage/symbolic/ginac/add.cpp sage/symbolic/ginac/archive.cpp sage/symbolic/ginac/assume.cpp sage/symbolic/ginac/basic.cpp sage/symbolic/ginac/cmatcher.cpp sage/symbolic/ginac/constant.cpp sage/symbolic/ginac/context.cpp sage/symbolic/ginac/ex.cpp sage/symbolic/ginac/expair.cpp sage/symbolic/ginac/expairseq.cpp sage/symbolic/ginac/exprseq.cpp sage/symbolic/ginac/fderivative.cpp sage/symbolic/ginac/function.cpp sage/symbolic/ginac/function_info.cpp sage/symbolic/ginac/infinity.cpp sage/symbolic/ginac/infoflagbase.cpp sage/symbolic/ginac/inifcns.cpp sage/symbolic/ginac/inifcns_comb.cpp sage/symbolic/ginac/inifcns_gamma.cpp sage/symbolic/ginac/inifcns_hyperb.cpp sage/symbolic/ginac/inifcns_hyperg.cpp sage/symbolic/ginac/inifcns_nstdsums.cpp sage/symbolic/ginac/inifcns_orthopoly.cpp sage/symbolic/ginac/inifcns_trans.cpp sage/symbolic/ginac/inifcns_trig.cpp sage/symbolic/ginac/inifcns_zeta.cpp sage/symbolic/ginac/lst.cpp sage/symbolic/ginac/matrix.cpp sage/symbolic/ginac/mpoly-giac.cpp sage/symbolic/ginac/mpoly-ginac.cpp sage/symbolic/ginac/mpoly-singular.cpp sage/symbolic/ginac/mpoly.cpp sage/symbolic/ginac/mul.cpp sage/symbolic/ginac/normal.cpp sage/symbolic/ginac/numeric.cpp sage/symbolic/ginac/operators.cpp sage/symbolic/ginac/order.cpp sage/symbolic/ginac/power.cpp sage/symbolic/ginac/print.cpp sage/symbolic/ginac/pseries.cpp sage/symbolic/ginac/py_funcs.cpp sage/symbolic/ginac/registrar.cpp sage/symbolic/ginac/relational.cpp sage/symbolic/ginac/remember.cpp sage/symbolic/ginac/sum.cpp sage/symbolic/ginac/symbol.cpp sage/symbolic/ginac/templates.cpp sage/symbolic/ginac/upoly-ginac.cpp sage/symbolic/ginac/useries.cpp sage/symbolic/ginac/utils.cpp sage/symbolic/ginac/wildcard.cpp
+# distutils: sources = sage/symbolic/ginac/add.cpp sage/symbolic/ginac/archive.cpp sage/symbolic/ginac/assume.cpp sage/symbolic/ginac/basic.cpp sage/symbolic/ginac/cmatcher.cpp sage/symbolic/ginac/constant.cpp sage/symbolic/ginac/context.cpp sage/symbolic/ginac/ex.cpp sage/symbolic/ginac/expair.cpp sage/symbolic/ginac/expairseq.cpp sage/symbolic/ginac/exprseq.cpp sage/symbolic/ginac/fderivative.cpp sage/symbolic/ginac/function.cpp sage/symbolic/ginac/function_info.cpp sage/symbolic/ginac/infinity.cpp sage/symbolic/ginac/infoflagbase.cpp sage/symbolic/ginac/inifcns.cpp sage/symbolic/ginac/inifcns_comb.cpp sage/symbolic/ginac/inifcns_gamma.cpp sage/symbolic/ginac/inifcns_hyperb.cpp sage/symbolic/ginac/inifcns_hyperg.cpp sage/symbolic/ginac/inifcns_nstdsums.cpp sage/symbolic/ginac/inifcns_orthopoly.cpp sage/symbolic/ginac/inifcns_trans.cpp sage/symbolic/ginac/inifcns_trig.cpp sage/symbolic/ginac/inifcns_zeta.cpp sage/symbolic/ginac/lst.cpp sage/symbolic/ginac/matrix.cpp sage/symbolic/ginac/mpoly-ginac.cpp sage/symbolic/ginac/mpoly-singular.cpp sage/symbolic/ginac/mpoly.cpp sage/symbolic/ginac/mul.cpp sage/symbolic/ginac/normal.cpp sage/symbolic/ginac/numeric.cpp sage/symbolic/ginac/operators.cpp sage/symbolic/ginac/order.cpp sage/symbolic/ginac/power.cpp sage/symbolic/ginac/print.cpp sage/symbolic/ginac/pseries.cpp sage/symbolic/ginac/py_funcs.cpp sage/symbolic/ginac/registrar.cpp sage/symbolic/ginac/relational.cpp sage/symbolic/ginac/remember.cpp sage/symbolic/ginac/sum.cpp sage/symbolic/ginac/symbol.cpp sage/symbolic/ginac/templates.cpp sage/symbolic/ginac/upoly-ginac.cpp sage/symbolic/ginac/useries.cpp sage/symbolic/ginac/utils.cpp sage/symbolic/ginac/wildcard.cpp
 # distutils: language = c++
 # distutils: libraries = flint gmp SINGULAR_LIBRARIES
 # distutils: extra_compile_args = -std=c++11 SINGULAR_CFLAGS