add required scallop configure options and related wrapper script

These should be used externally to build with the options required by
scallop otherwise it's unsupported when used for pkgcraft.

Author: radhermit

configure-scallop

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# Configure bash using the required scallop options.
+
+# change working directory to bash repo
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+# load required configure options
+declare -a myconf
+while IFS= read -r line; do
+	[[ -z ${line} || ${line} =~ ^# ]] && continue
+	myconf+=( ${line} )
+done < configure-scallop-options
+
+# configure using defined options
+./configure "${myconf[@]}"

configure-scallop-options

@@ -0,0 +1,19 @@
+# configure options required by scallop
+
+--disable-readline
+--disable-history
+--disable-bang-history
+--disable-progcomp
+--without-bash-malloc
+--disable-mem-scramble
+--disable-net-redirections
+--disable-nls
+
+# job control is required for $PIPESTATUS
+--enable-job-control
+
+# enable restricted shell
+--enable-restricted
+
+# enable scallop library
+--enable-library