Enable glibc/arm build of samba

ports/samba/build.sh

 #!/bin/bash
 # Copyright (c) 2015 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.
 
 # Samba doesn't seem to support building outside the source tree.
 BUILD_DIR=${SRC_DIR}
 
 EnableGlibcCompat
 
 ConfigureStep() {
   conf_build=$(/bin/sh "${SCRIPT_DIR}/config.guess")
+  NACLPORTS_CPPFLAGS="${NACLPORTS_CPPFLAGS/-fdiagnostics-color=auto/}"
+  NACLPORTS_LDFLAGS="${NACLPORTS_CPPFLAGS/-fdiagnostics-color=auto/}"
+  NACLPORTS_CPPFLAGS+=" -DFIONREAD=0"
 
   SetupCrossEnvironment
 
   local CONFIGURE=${NACL_CONFIGURE_PATH:-${SRC_DIR}/configure}
   local conf_host=${NACL_CROSS_PREFIX}
   if [ "${NACL_ARCH}" = "pnacl" -o "${NACL_ARCH}" = "emscripten" ]; 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".
@@ skipping 71 matching lines @@
   LogExecute ln -sf libwind-samba4.so libwind-samba4.so.0
   LogExecute ln -sf libtevent.so libtevent.so.0
   LogExecute ln -sf libgssapi-samba4.so libgssapi-samba4.so.2
   LogExecute ln -sf libhcrypto-samba4.so libhcrypto-samba4.so.5
   LogExecute ln -sf libheimbase-samba4.so libheimbase-samba4.so.1
   LogExecute ln -sf libndr-krb5pac.so libndr-krb5pac.so.0
   LogExecute ln -sf libtevent-util.so libtevent-util.so.0
   LogExecute ln -sf libsamba-credentials.so libsamba-credentials.so.0
   LogExecute ln -sf libsamba-hostconfig.so libsamba-hostconfig.so.0
 }