add git-remote-annex to standalone builds

Didn't add to windows installer because I don't currently have a Windows
system to test.

standalone/linux/skel/README

@@ -4,7 +4,7 @@ as if you'd installed it using a package manager.
 
 Or, you can use the runshell script in this directory to start a shell
 that is configured to use git-annex and the other utilities included in
-this bundle, including git, gpg, rsync, ssh, etc.
+this bundle.
 
 This should work on any Linux system of the appropriate architecture.
 More or less.

standalone/linux/skel/git-remote-annex

@@ -0,0 +1,24 @@
+#!/bin/sh
+link="$(readlink -f "$0" 2>/dev/null || readlink "$0")" || true
+if [ -n "$link" ]; then
+	base="$(dirname "$link")"
+else
+	base="$(dirname "$0")"
+fi
+
+if [ ! -d "$base" ]; then
+	echo "** cannot find base directory (I seem to be $0)" >&2
+	exit 1
+fi
+if [ ! -e "$base/runshell" ]; then
+	echo "** cannot find $base/runshell" >&2
+	exit 1
+fi
+
+# Get absolute path to base, to avoid breakage when things change directories.
+orig="$(pwd)"
+cd "$base"
+base="$(pwd)"
+cd "$orig"
+
+exec "$base/runshell" git-remote-annex "$@"

standalone/linux/skel/runshell

@@ -211,7 +211,7 @@ case "$os" in
 			# not the bundled one.
 			rm -f bin/uname
 			# Fix shell scripts to work when run inside proot.
-			termux-fix-shebang bin/* runshell git-annex git-annex-shell git-annex-webapp 
+			termux-fix-shebang bin/* runshell git-annex git-annex-shell git-annex-webapp git-remote-annex
 			cd "$orig"
 			# Save the poor Android user the typing.
 			if echo "$SHELL" | grep -q '/bash'; then

standalone/osx/git-annex.app/Contents/MacOS/README

@@ -6,4 +6,4 @@ this README into your PATH.
 
 Or, you can use the runshell script in this directory to start a shell
 that is configured to use git-annex and the other utilities included in
-this bundle, including git, gpg, rsync, ssh, etc.
+this bundle.

standalone/osx/git-annex.app/Contents/MacOS/git-remote-annex

@@ -0,0 +1,31 @@
+#!/bin/sh
+link="$(readlink "$0")" || true
+if [ -n "$link" ]; then
+	base="$(dirname "$link")"
+else
+	base="$(dirname "$0")"
+fi
+
+if [ ! -d "$base" ]; then
+	echo "** cannot find base directory (I seem to be $0)" >&2
+	exit 1
+fi
+if [ ! -e "$base/runshell" ]; then
+	echo "** cannot find $base/runshell" >&2
+	exit 1
+fi
+
+# Get absolute path to base, to avoid breakage when things change directories.
+orig="$(pwd)"
+cd "$base"
+base="$(pwd)"
+cd "$orig"
+
+# If this is a standalone app, set a variable that git-annex can use to
+# install itself.
+if [ -e "$base/git-annex" ]; then
+	GIT_ANNEX_APP_BASE="$base"
+	export GIT_ANNEX_APP_BASE
+fi
+
+exec "$base/runshell" git-remote-annex "$@"