Add script to use UEFIExtract

This avoids having to build UEFITool manually, which requires qt5.

scripts/extract.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+set -e
+
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+TOOL_DIR="$SCRIPT_DIR/../tools"
+UEFIEXTRACT_DIR="$TOOL_DIR/UEFITool/UEFIExtract"
+
+# Make sure UEFITool submodule is checked out
+if [ ! -d "$UEFIEXTRACT_DIR" ]
+then
+	pushd "$TOOL_DIR" >/dev/null
+	git submodule update --init UEFITool
+	popd >/dev/null
+fi
+
+# Make sure UEFIExtract is built
+if [ ! -f "$UEFIEXTRACT_DIR/UEFIExtract" ]
+then
+    pushd "$UEFIEXTRACT_DIR" > /dev/null
+    cmake -B . -G "Unix Makefiles" -DCMAKE_CXX_FLAGS="-Os" -DCMAKE_C_FLAGS="-Os"
+    cmake --build .
+    popd > /dev/null
+fi
+
+"$UEFIEXTRACT_DIR/UEFIExtract" "$@"