Add xcode extraction script

contrib/macdeploy/extract-osx-sdk.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Copyright (c) 2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+set -e
+
+INPUTFILE="Xcode_7.3.1.dmg"
+HFSFILENAME="5.hfs"
+SDKDIR="Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk"
+
+7z x "${INPUTFILE}" "${HFSFILENAME}"
+SDKNAME="$(basename "${SDKDIR}")"
+SDKDIRINODE=$(ifind -n "${SDKDIR}" "${HFSFILENAME}")
+fls "${HFSFILENAME}" -rpF ${SDKDIRINODE} |
+ while read type inode filename; do
+	inode="${inode::-1}"
+	if [ "${filename:0:14}" = "usr/share/man/" ]; then
+		continue
+	fi
+	filename="${SDKNAME}/$filename"
+	echo "Extracting $filename ..."
+	mkdir -p "$(dirname "$filename")"
+	if [ "$type" = "l/l" ]; then
+		ln -s "$(icat "${HFSFILENAME}" $inode)" "$filename"
+	else
+		icat "${HFSFILENAME}" $inode >"$filename"
+	fi
+done
+echo "Building ${SDKNAME}.tar.gz ..."
+MTIME="$(istat "${HFSFILENAME}" "${SDKDIRINODE}" | perl -nle 'm/Content Modified:\s+(.*?)\s\(/ && print $1')"
+find "${SDKNAME}" | sort | tar --no-recursion --mtime="${MTIME}" --mode='u+rw,go+r-w,a+X' --owner=0 --group=0 -c -T - | gzip -9n > "${SDKNAME}.tar.gz"
+echo 'All done!'