Log Message:
math/sc-im: update to 0.8.4

# pkgsrc changes
* make threads and x11 support opt-in
* do not require bison
* fix Lua detection from pkg-config
* package builds fine with lua54: use LUA_PACKAGE

# upstream changes
v0.8.4

06/12/2023: :datefmt does not remove text content anymore
	allowing future edition - work on item 3 of issue 769
06/11/2023: avoid changing cell's color after :format - issue 819
06/11/2023: avoid blanking cell's text content after :datefmt
06/10/2023: fix number 2 of issue 769
06/02/2023: fix configuration variable name in file.c:
	import_delimited_to_text
06/01/2023: restore transpose
06/01/2023: added input_edit_mode setting PR 626
06/01/2023: work on issue 708: xlsx file import
06/01/2023: Fix issue 784: get row number and column or cell that calls
	a LUA script with PR 814.
06/01/2023: merged PR 783 that gets rid of issue 778 - changed load_rc
	load_file order.06/01/2023: merged PR 776
06/01/2023: merged PR 789
06/01/2023: fix issue in csv import - 816
02/03/2024: fix issue 868
17/05/2024: fix missing include
20/05/2024: PR 871
02/07/2024: Modify Makefile to work with brew's ncurses
10/07/2024: PR 880 / 861
16/07/2024: work on issue 878
23/07/2024: work on issue 875 / 879