dev-libs/antlr-c: fix autoconf macro; drop (repurpose) invalid USE=debug

* Fix unnecessary use of AC_INCLUDES_DEFAULT (configure script + image is the same
  without it) which causes noise in ./configure
* Drop USE=debug for debug symbols (invalid)
* Rename USE=debugger -> USE=debug to match what USE=debug is really for
* Cleanup 64-bit test

Closes: https://bugs.gentoo.org/921345
Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/antlr-c/antlr-c-3.5.2-r3.ebuild

@@ -0,0 +1,62 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools toolchain-funcs
+
+MY_PN="${PN%-c}"
+DESCRIPTION="The ANTLR3 C Runtime"
+HOMEPAGE="https://www.antlr3.org/"
+SRC_URI="https://github.com/${MY_PN}/${MY_PN}3/archive/${PV}.tar.gz -> ${MY_PN}-${PV}.tar.gz"
+S="${WORKDIR}/${MY_PN}3-${PV}/runtime/C"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~ppc ~x86"
+IUSE="debug doc"
+
+BDEPEND="doc? ( app-doc/doxygen[dot] )"
+
+PATCHES=(
+	"${FILESDIR}/3.5-cflags.patch"
+	"${FILESDIR}/3.5-autoconf.patch"
+)
+
+src_prepare() {
+	default
+
+	sed -i '/^QUIET/s/NO/YES/' doxyfile || die
+	eautoreconf
+}
+
+src_configure() {
+	local econfargs=(
+		$(use_enable debug antlrdebug)
+	)
+
+	case "$(tc-get-ptr-size)" in
+		8) econfargs+=( --enable-64bit ) ;;
+		4) econfargs+=( --disable-64bit ) ;;
+	esac
+
+	CONFIG_SHELL="${BROOT}"/bin/bash econf "${econfargs[@]}"
+}
+
+src_compile() {
+	default
+
+	if use doc ; then
+		einfo "Generating API documentation ..."
+		doxygen -u doxyfile || die
+		doxygen doxyfile || die
+
+		HTML_DOCS=( "${S}"/api/ )
+	fi
+}
+
+src_install() {
+	default
+
+	find "${ED}" -name '*.la' -delete || die
+}

dev-libs/antlr-c/files/3.5-autoconf.patch

@@ -0,0 +1,11 @@
+https://bugs.gentoo.org/921345
+--- a/configure.ac
++++ b/configure.ac
+@@ -148,7 +148,6 @@ AC_PROG_MAKE_SET
+ # Checks for libraries.
+ 
+ # Checks for header files.
+-AC_INCLUDES_DEFAULT()
+ AC_HEADER_RESOLV
+ AC_CHECK_HEADERS([sys/malloc.h malloc.h], [], [],
+ [[#ifdef HAVE_SYS_MALLOC_H