added package.sh to create pkg

package.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e -u -x
+
+if [[ -z "$1" -o -z "$2" ]]; then
+    echo "Usage: $0 <identifier> <version>"
+    exit 1
+fi
+
+xcodebuild
+mkdir -p build/bash-pkg/bin
+cp build/Release/{bash,sh} build/bash-pkg/bin/
+sudo chown -R root:wheel build/bash-pkg
+sudo chmod 755 build/bash-pkg/{,bin/}
+sudo chmod 555 build/bash-pkg/bin/{bash,sh}
+pkgbuild --root build/bash-pkg \
+    --identifier $1 \
+    --version $2 \
+    --ownership recommended \
+    macosx-bash-92-shellshock-patched.pkg
+sudo rm -r build/bash-pkg
+
+