Makefile.inc1: Remove svn support

We don't need this, and we don't use this. It's left over from the svn
days. We stopped supporting svn as a project entirely when 12.x went
EOL. And VCS_REVSION isn't in any current ucl file or anywhere else in
the tree.

Sponsored by:		Netflix
Reviewed by	:	kevans, brd
Differential Revision:	https://reviews.freebsd.org/D52912

Makefile.inc1

@@ -522,27 +522,6 @@ BUILDENV_SHELL?=${SHELL}
 BUILDENV_SHELL?=/bin/sh
 .endif
 
-.if !defined(_MKSHOWCONFIG)
-.if !defined(VCS_REVISION) || empty(VCS_REVISION)
-.if !defined(SVNVERSION_CMD) || empty(SVNVERSION_CMD)
-. for _D in ${PATH:S,:, ,g}
-.  if exists(${_D}/svnversion)
-SVNVERSION_CMD?=${_D}/svnversion
-.  endif
-.  if exists(${_D}/svnliteversion)
-SVNVERSION_CMD?=${_D}/svnliteversion
-.  endif
-. endfor
-.endif
-.if defined(SVNVERSION_CMD) && !empty(SVNVERSION_CMD)
-_VCS_REVISION?=	$$(eval ${SVNVERSION_CMD} ${SRCDIR})
-. if !empty(_VCS_REVISION)
-VCS_REVISION=	$$(echo r${_VCS_REVISION})
-.export VCS_REVISION
-. endif
-.endif
-.endif
-
 .if !defined(GIT_CMD) || empty(GIT_CMD)
 . for _P in /usr/bin /usr/local/bin
 .  if exists(${_P}/git)
@@ -2225,9 +2204,6 @@ create-world-package-${pkgname}: .PHONY
 		/^name/ { printf("===> Creating %s-", $$2); next } \
 		/^version/ { print $$2; next } \
 		' ${WSTAGEDIR}/${pkgname}.ucl
-	@if [ "${pkgname}" == "runtime" ]; then \
-		sed -i '' -e "s/%VCS_REVISION%/${VCS_REVISION}/" ${WSTAGEDIR}/${pkgname}.ucl ; \
-	fi
 	${PKG_CMD} -o ABI=${PKG_ABI} -o ALLOW_BASE_SHLIBS=yes \
 		-o OSVERSION="${SRCRELDATE}" \
 		create -f ${PKG_FORMAT} ${PKG_CLEVEL} \