x11-wm/phoc: move bundled wlroots to -phosh flavor

Partially revert 4ea852fab0 after 79c3c08148. Other consumers
may not need Phosh-specific changes from PureOS, and system wlroots
helps debugging bundled version.

x11-wm/phoc/Makefile

@@ -19,6 +19,8 @@ LIB_DEPENDS=	libwayland-server.so:graphics/wayland \
 		libxkbcommon.so:x11/libxkbcommon
 RUN_DEPENDS=	${LOCALBASE}/share/glib-2.0/schemas/org.gnome.mutter.gschema.xml:x11-wm/mutter
 
+FLAVORS=	default phosh
+
 USES=		compiler:c11 gl gnome meson pkgconfig python:build shebangfix xorg
 USE_GITLAB=	yes
 USE_GL=		glesv2
@@ -32,5 +34,16 @@ CFLAGS+=	-Wno-error=format-nonliteral # clang
 PLIST_FILES=	bin/${PORTNAME}
 GLIB_SCHEMAS=	sm.puri.phoc.gschema.xml
 
+.if ${FLAVOR:U} == phosh
+PKGNAMESUFFIX=	-${FLAVOR}
+COMMENT+=	(with patched wlroots from PureOS)
+EXTRA_PATCHES+=	${PATCHDIR}/extra-patch-private-wlroots
+CONFLICTS_INSTALL=	${PORTNAME}
 .include "${.CURDIR}/Makefile.wlroots"
+.else
+COMMENT+=	(with system wlroots)
+CONFLICTS_INSTALL=	${PORTNAME}-phosh
+.include "${.CURDIR:H:H}/x11-toolkits/wlroots015/override.mk"
+.endif
+
 .include <bsd.port.mk>