x11/tilix: disable SSP unsupported by lang/ldc

meson.build:1:0: ERROR: Unable to detect linker for compiler `ldc2 -L=--version /tmp/tmpo84ihqx4.d -fstack-protector-strong`
stdout:
stderr: ldc2: Unknown command line argument '-fstack-protector-strong'.  Try: 'ldc2 --help'
ldc2: Did you mean '--stack-symbol-ordering'?

PR:		264776
Reported by:	antoine (via exp-run)
Regressed by:	mesonbuild/meson@235c78682e82

x11/tilix/Makefile

@@ -21,6 +21,7 @@ USE_GITHUB=	yes
 GH_ACCOUNT=	gnunn1
 USE_GNOME=	cairo gdkpixbuf2 librsvg2 vte3
 USE_XORG=	x11
+SSP_UNSAFE=	yes
 GLIB_SCHEMAS=	com.gexperts.Tilix.gschema.xml
 SHEBANG_FILES=	data/scripts/tilix_int.sh