x11-misc/devilspie: pass -std=gnu17 for gcc15

May be an easy fix, but there's been no releases since 2012 and if
there's been commits I don't know where they're happening. It's not
worth keeping a (probably) permanent patch over.

devilspie2 (w/ a semi-active different upstream) can act as a
replacement if need be, albeit this one uses different configuration
that some may prefer and no reason to last-rite over trivial issues.

Closes: https://bugs.gentoo.org/944096
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

x11-misc/devilspie/devilspie-0.23-r2.ebuild

@@ -1,8 +1,10 @@
-# Copyright 1999-2022 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
 
+inherit flag-o-matic
+
 DESCRIPTION="Window matching utility similar to Sawfish's Matched Windows"
 HOMEPAGE="https://www.burtonini.com/blog/tag/devilspie.html"
 SRC_URI="https://www.burtonini.com/computing/${P}.tar.xz"
@@ -15,16 +17,21 @@ RDEPEND="
 	dev-libs/glib:2
 	x11-libs/gtk+:3[X]
 	x11-libs/libX11
-	x11-libs/libwnck:3"
+	x11-libs/libwnck:3
+"
 DEPEND="
 	${RDEPEND}
-	x11-base/xorg-proto"
+	x11-base/xorg-proto
+"
 BDEPEND="
 	dev-util/intltool
-	virtual/pkgconfig"
+	virtual/pkgconfig
+"
 
 src_prepare() {
 	default
 
 	sed -i "/doc\//s@devilspie..@${PF}/@" devilspie.1 || die
+
+	append-cflags -std=gnu17 #944096
 }