Bootstrapping without cwrappers

[Pierre Pronchery <khorben%defora.org@localhost>]

			Hi tech-pkg@,

since cwrappers was enabled by default on some platforms, it is 
effectively impossible to bootstrap without cwrappers there.

The patch attached here is a first attempt at fixing it. It basically 
turns "--cwrappers" into "--cwrappers <auto|yes|no>", while keeping the 
default to "auto" of course.
Thoughts?

Cheers,
--
khorben

Index: bootstrap
===================================================================
RCS file: /cvsroot/pkgsrc/bootstrap/bootstrap,v
retrieving revision 1.240
diff -p -u -r1.240 bootstrap
--- bootstrap	11 Feb 2017 16:08:31 -0000	1.240
+++ bootstrap	16 Apr 2017 16:59:04 -0000
@@ -58,7 +58,7 @@ usage="Usage: $0 "'
     [ --binary-kit <tarball> ]
     [ --binary-macpkg <pkg> ]
     [ --compiler <compiler> ]
-    [ --cwrappers ]
+    [ --cwrappers <auto|yes|no> ]
     [ --full ]
     [ --gzip-binary-kit <tarball> ]
     [ --help ]
@@ -407,7 +407,7 @@ sysconfdir=
 varbase=
 
 compiler=""
-cwrappers=no
+cwrappers=auto
 full=no
 make_jobs=1
 mk_fragment=
@@ -433,7 +433,8 @@ while [ $# -gt 0 ]; do
 	--compiler)	compiler="$2"; shift ;;
 	--abi=*)	abi=`get_optarg "$1"` ;;
 	--abi)		abi="$2"; shift ;;
-	--cwrappers)	cwrappers=yes ;;
+	--cwrappers=*)	cwrappers=`get_optarg "$1"` ;;
+	--cwrappers)	cwrappers="$2"; shift ;;
 	--unprivileged | --ignore-user-check) unprivileged=yes ;;
 	--prefer-pkgsrc=*)
 			prefer_pkgsrc=`get_optarg "$1"` ;;
@@ -1086,8 +1087,8 @@ BOOTSTRAP_MKCONF=${wrkdir}/mk.conf
 cp ${TARGET_MKCONF} ${BOOTSTRAP_MKCONF}
 
 case "$cwrappers" in
-yes)
-	echo "USE_CWRAPPERS=		yes" >> ${TARGET_MKCONF}
+yes|no)
+	echo "USE_CWRAPPERS=		$cwrappers" >> ${TARGET_MKCONF}
 	echo "" >> ${TARGET_MKCONF}
 	;;
 esac