sysutils/tree: provide fallback download URL and other improvements

- For some reason, upstream distfile site is currently inaccessible
  in certain parts of the world, e.g. Russia
- Pass build-related variables down to inner Makefile via MAKE_ARGS
  and remove the patch file (particularly, it was patching `install'
  target which is useless as the port is using its own)
- Adjust LICENSE (it's GPLv2 or later) and install documentation in
  the dedicated helper target (also install TODO file while here)

PR:	261547

sysutils/tree/Makefile

@@ -3,27 +3,29 @@
 PORTNAME=	tree
 PORTVERSION=	2.0.1
 CATEGORIES=	sysutils
-MASTER_SITES=	http://mama.indstate.edu/users/ice/tree/src/
+MASTER_SITES=	http://mama.indstate.edu/users/ice/tree/src/ \
+		https://fossies.org/linux/misc/
 
 MAINTAINER=	gb@unistra.fr
 COMMENT=	Display a tree-view of directories with optional color or HTML output
 
-LICENSE=	GPLv2
+LICENSE=	GPLv2+
 
-MAKE_ENV+=	MKDIR="${MKDIR}"
 USES=		gmake tar:tgz
+MAKE_ARGS=	CC="${CC}" CFLAGS="${CFLAGS}" LDFLAGS="${LDFLAGS}"
 
 PLIST_FILES=	bin/tree \
 		man/man1/tree.1.gz \
 		man/man1/tree.fr.1.gz
-
-PORTDOCS=	CHANGES README
+PORTDOCS=	CHANGES README TODO
 
 OPTIONS_DEFINE=	DOCS
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/tree ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_MAN} ${WRKSRC}/doc/*.1 ${STAGEDIR}${MAN1PREFIX}/man/man1
+
+do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${PORTDOCS:S,^,${WRKSRC}/,} ${STAGEDIR}${DOCSDIR}