Add quakespasm, and OpenGL+SDL-based port of quake1.

ports/quakespasm/build.sh

+#!/bin/bash
+# Copyright (c) 2013 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+BUILD_DIR=${SRC_DIR}/Quake
+EXECUTABLES=quakespasm${NACL_EXEEXT}
+MAKE_TARGETS="MP3LIB=mpg123"
+
+ConfigureStep() {
+  return
+}
+
+BuildStep() {
+  make clean
+  if [ "${NACL_DEBUG}" = "1" ]; then
+    MAKE_TARGETS+=" DEBUG=1"
+  fi
+  SetupCrossEnvironment
+  DefaultBuildStep
+}
+
+InstallStep() {
+  MakeDir ${PUBLISH_DIR}
+  LogExecute cp ${START_DIR}/index.html ${PUBLISH_DIR}
+  LogExecute cp ${START_DIR}/quakespasm.js ${PUBLISH_DIR}
+  LogExecute cp ${NACL_SRC}/third_party/zip.js/WebContent/*.js ${PUBLISH_DIR}
+  LogExecute cp ${BUILD_DIR}/quakespasm${NACL_EXEEXT} ${PUBLISH_DIR}
+  ChangeDir ${PUBLISH_DIR}
+  LogExecute ${NACL_SDK_ROOT}/tools/create_nmf.py -s . \
+      quakespasm${NACL_EXEEXT} -o quakespasm.nmf
+  if [ "${NACL_ARCH}" = "pnacl" ]; then
+    sed -i.bak 's/x-nacl/x-pnacl/' quake.html
+  fi
+}