core: remove build with autotools

CMake is now the only way to build WeeChat.

src/plugins/spell/Makefile.am

@@ -1,44 +0,0 @@
-#
-# Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
-# Copyright (C) 2006-2023 Sébastien Helleu <flashcode@flashtux.org>
-#
-# This file is part of WeeChat, the extensible chat client.
-#
-# WeeChat is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# WeeChat is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
-#
-
-AM_CPPFLAGS = -DLOCALEDIR=\"$(datadir)/locale\" $(ASPELL_CFLAGS) $(ENCHANT_CFLAGS)
-
-libdir = ${weechat_libdir}/plugins
-
-lib_LTLIBRARIES = spell.la
-
-spell_la_SOURCES = spell.c \
-                   spell.h \
-                   spell-bar-item.c \
-                   spell-bar-item.h \
-                   spell-command.c \
-                   spell-command.h \
-                   spell-completion.c \
-                   spell-completion.h \
-                   spell-config.c \
-                   spell-config.h \
-                   spell-info.c \
-                   spell-info.h \
-                   spell-speller.c \
-                   spell-speller.h
-spell_la_LDFLAGS = -module -no-undefined
-spell_la_LIBADD  = $(ASPELL_LFLAGS) $(ENCHANT_LIBS)
-
-EXTRA_DIST = CMakeLists.txt