Makefile: add missing dependencies of 'config-list.h'

We auto-generate the list of supported configuration variables from 'Documentation/config/*.txt', and that list used to be created by the 'generate-cmdlist.sh' helper script and stored in the 'command-list.h' header. Commit 709df95b78 (help: move list_config_help to builtin/help, 2020-04-16) extracted this into a dedicated 'generate-configlist.sh' script and 'config-list.h' header, and added a new target in the 'Makefile' as well, but while doing so it forgot to extract the dependencies of the latter. Consequently, since then 'config-list.h' is not re-generated when 'Documentation/config/*.txt' is updated, while 'command-list.h' is re-generated unnecessarily: $ touch Documentation/config/log.txt $ make -j4 GEN command-list.h CC help.o AR libgit.a Fix this and list all config-related documentation files as dependencies of 'config-list.h' and remove them from the dependencies of 'command-list.h'. $ touch Documentation/config/log.txt $ make GEN config-list.h CC builtin/help.o LINK git Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>