media-video/aegisub: depend on luajit[lua52compat] in live ebuild

Upstream states that luajit built with Lua 5.2 support is required.
See http://devel.aegisub.org/ticket/1904#comment:2

Package-Manager: portage-2.2.26

media-video/aegisub/aegisub-9999.ebuild

@@ -24,7 +24,7 @@ IUSE="alsa debug +ffmpeg +fftw openal oss portaudio pulseaudio spell"
 # However, most of these minimal versions date back to 2006-2010 yy.
 # Such version specifiers are meaningless nowadays, so they are omitted.
 RDEPEND="
-	>=dev-lang/luajit-2.0.4:2
+	>=dev-lang/luajit-2.0.4:2[lua52compat]
 	>=dev-libs/boost-1.50.0:=[icu,nls,threads]
 	>=dev-libs/icu-4.8.1.1:=
 	>=x11-libs/wxGTK-3.0.0:${WX_GTK_VER}[X,opengl,debug?]