install: new option: --strip-program,

...to specify the program used to strip binaries
* src/install.c (main): Handle new option --strip-program.
(strip): Use strip program from global variable strip_program.
(usage): Mention new option --strip-program in --help.
* tests/tests/strip-program: Test case for new option --strip-program.
* tests/Makefile.am: Add new test case to test set.
* doc/coreutils.texi: Mention new option --strip-program.
* NEWS: Mention the change.
* TODO: Remove completed task.

tests/install/strip-program

@@ -0,0 +1,41 @@
+#!/bin/sh
+# Ensure "install -s --strip-program=PROGRAM" uses the program to strip
+
+# Copyright (C) 2008 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  ginstall --version
+fi
+
+. $srcdir/test-lib.sh
+
+working_umask_or_skip_
+
+cat <<EOF > b || framework_failure
+#!$POSIX_SHELL
+sed s/b/B/ \$1 > \$1.t && mv \$1.t \$1
+EOF
+chmod a+x b || framework_failure
+
+fail=0
+
+echo abc > src || fail=1
+echo aBc > exp || fail=1
+ginstall src dest -s --strip-program=./b || fail=1
+compare dest exp || fail=1
+
+(exit $fail); exit $fail