lxde-base/lxinput: build w/ -std=gnu17

On life-support upstream.

Closes: https://bugs.gentoo.org/944065
Signed-off-by: Sam James <sam@gentoo.org>

lxde-base/lxinput/lxinput-0.3.5-r2.ebuild

@@ -3,6 +3,8 @@
 
 EAPI=7
 
+inherit flag-o-matic
+
 DESCRIPTION="LXDE keyboard and mouse configuration tool"
 HOMEPAGE="https://lxde.org/"
 SRC_URI="https://downloads.sourceforge.net/lxde/${P}.tar.xz"
@@ -10,7 +12,6 @@ SRC_URI="https://downloads.sourceforge.net/lxde/${P}.tar.xz"
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~ppc ~riscv ~x86 ~x86-linux"
-IUSE=""
 
 RDEPEND="
 	dev-libs/glib:2
@@ -25,6 +26,8 @@ BDEPEND="
 "
 
 src_configure() {
-	econf \
-		--enable-gtk3
+	# bug #944065
+	append-flags -std=gnu17
+
+	econf --enable-gtk3
 }