build: Enable unprivileged builds and installs.

Set ${INSTALL} makefile variables to "${TOOLBINDIR}/binstall -U"
where the "-U" option enables unprivileged mode in binstall(1).

Files and executables installed into ${DESTDIR} will be installed
with the privileges of the build user, so super-user privileges
are no longer used or required.

The use of sudo(8) has been removed from the distribution make
target and the ${FSIMG} make target that uses fsutil(1).

fsutil(1) still generates a file system image with the correct
owners, groups, and file permissions, as per the manifest spec.

Makefile

@@ -51,7 +51,7 @@ all:		symlinks tools
 			${MAKE} -C $$dir ; done
 		for dir in ${SUBDIR} ; do \
 			${MAKE} -C $$dir DESTDIR=${DESTDIR} install ; done
-		sudo ${MAKE} -C etc DESTDIR=${DESTDIR} distribution
+		${MAKE} -C etc DESTDIR=${DESTDIR} distribution
 		$(MAKE) fs
 
 tools:
@@ -67,7 +67,7 @@ ${FSIMG}:	distrib/${MACHINE}/md.${MACHINE} distrib/base/mi.home
 		rm -f $@ distrib/$(MACHINE)/_manifest
 		cat distrib/base/mi distrib/$(MACHINE)/md.$(MACHINE) > distrib/$(MACHINE)/_manifest
 		$(FSUTIL) --repartition=fs=$(FS_MBYTES)M:swap=$(SWAP_MBYTES)M:fs=$(U_MBYTES)M $@
-		sudo $(FSUTIL) --new --partition=1 --manifest=distrib/$(MACHINE)/_manifest $@ ${DESTDIR}
+		${FSUTIL} --new --partition=1 --manifest=distrib/${MACHINE}/_manifest $@ ${DESTDIR}
 # In case you need a separate /home partition,
 # uncomment the following line.
 		$(FSUTIL) --new --partition=3 --manifest=distrib/base/mi.home $@ distrib/home

share/mk/sys.mk

@@ -95,7 +95,7 @@ SIZE=		${GCCPREFIX}-size
 AS=		${CC} -x assembler-with-cpp -c
 
 LEX=		flex
-INSTALL=	install
+INSTALL=	${TOOLBINDIR}/binstall -U
 
 TAGSFILE=	tags
 

tools/Makefile.inc

@@ -9,7 +9,7 @@ HOST_CC?=	cc
 
 CC=		${HOST_CC}
 
-INSTALL=	install
+INSTALL=	${TOOLBINDIR}/binstall -U
 
 YACC!=		if [ x"${_HOST_OSNAME}" = x"Linux" ] ; then \
 			echo "byacc" ; \