savegame2.c: "unused entry" warnings about about activities order
#44958 fixed "unused entry" warnings about S3_0 savegame3.c. However, those entries are written by S2_6 already, so they are present in some old savegame2.c games too. That part needs to fixed too. Will also improve (at least unify with other similar "discard ... order" implementations) the savegame3.c part while at it.
Patches for S3_0 and S2_6 attached. Later branches not affected.