title: -headerpad_max_install_names is ignored when used with -bitcode_bundle
body: <p>Building my Xcode project gives the following warning:</p>
  
  <pre><code>/ld:-1: -headerpad_max_install_names is ignored when used with -bitcode_bundle (Xcode setting ENABLE_BITCODE=YES)
  </code></pre>
  
  <p>How to act upon this warning?</p>
  
  <p>Presumably Xcode is throwing this <code>headerpad_max_install_names</code> entity to the linker which is complaining.</p>
  
  <p>But I can't see WHERE. <code>grep</code>ping through my project does not find this token.</p>
  
  <p>I would like to achieve (and maintain) zero warnings.</p>
  
  <p>EDIT: I found in 
  myproject/External/cmake-modules/ios.toolchain.cmake:</p>
  
  <pre><code>if (ENABLE_BITCODE)
    set(BITCODE "-fembed-bitcode")
    set(HEADER_PAD "")
    message(STATUS "Enabling bitcode support.")
  else()
    set(BITCODE "")
    set(HEADER_PAD "-headerpad_max_install_names")
    message(STATUS "Disabling bitcode support.")
  endif()
  </code></pre>