src/MANIFEST.in: Remove redundant 'exclude'

Author: Matthias Koeppe

src/MANIFEST.in

@@ -50,7 +50,6 @@ prune sage/libs/coxeter3
 exclude sage/graphs/mcqd.p*
 exclude sage/libs/meataxe.p*
 exclude sage/matrix/matrix_gfpn_dense.p*
-exclude sage/graphs/graph_decompositions/sage_tdlib.cpp
 exclude sage/graphs/graph_decomposition/tdlib.p*
 
 # Exclude all__*.py files belonging to distributions related to optional packages