Some objects in libpng are built without iOS bitcode support

I've checked that https://bugzilla.gnome.org/show_bug.cgi?id=770875 was fixed and merged, I've built current GStreamer master using cerbero, but XCode still is not able to link the project with next message:

ld: '.../GStreamer.framework/GStreamer(libpng16_a_armv7s_-png.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture armv7s clang: error: linker command failed with exit code 1 (use -v to see invocation)