Consistent --host and --build arguments to configure

ports/ruby/build.sh

 # 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.
 
 MAKE_TARGETS="pprogram"
 INSTALL_TARGETS="install-nodoc"
 
 EXECUTABLES="ruby${NACL_EXEEXT} pepper-ruby${NACL_EXEEXT}"
 
 ConfigureStep() {
@@ skipping 14 matching lines @@
   EXTRA_CONFIGURE_ARGS=--disable-ipv6
 
   EnableGlibcCompat
 
   if [ "${NACL_LIBC}" = "newlib" ]; then
     EXTRA_CONFIGURE_ARGS+=" --with-static-linked-ext --with-newlib"
   else
     EXTRA_CONFIGURE_ARGS+=" --with-out-ext=openssl,digest/*"
   fi
 
-  local conf_host=${NACL_CROSS_PREFIX}
-  if [ ${NACL_ARCH} = "pnacl" ]; then
-    # The PNaCl tools use "pnacl-" as the prefix, but config.sub
-    # does not know about "pnacl".  It only knows about "le32-nacl".
-    # Unfortunately, most of the config.subs here are so old that
-    # it doesn't know about that "le32" either.  So we just say "nacl".
-    conf_host="nacl"
-  fi
-
   SetupCrossEnvironment
   LogExecute ${SRC_DIR}/configure \
-    --host=${conf_host} \
+    --host=${CONF_HOST} \
+    --build=${CONF_BUILD} \
     --prefix=/ \
     --with-baseruby=${HOST_BUILD}/inst/bin/ruby \
     --with-http=no \
     --with-html=no \
     --with-ftp=no \
     --${NACL_OPTION}-mmx \
     --${NACL_OPTION}-sse \
     --${NACL_OPTION}-sse2 \
     --${NACL_OPTION}-asm \
     --with-x=no \
     ${EXTRA_CONFIGURE_ARGS}
 }
 
 BuildStep() {
   DefaultBuildStep
   if [ $NACL_ARCH == "pnacl" ]; then
     # Just write the x86-64 version out for now.
     TranslateAndWriteLauncherScript ruby.pexe x86-64 ruby.x86-64.nexe ruby
   fi
 }
 
 InstallStep() {
   DESTDIR=${DESTDIR}/${PREFIX}
   DefaultInstallStep
 }