Add patch to fix duplicate symbol of webrtc and libjingle.

duplicate symbol __Z35p_convertHostCFStringRefToCPPStringPK10__CFStringRSs in:
  libjingle.a(libjingle.macconversion.o)
  libwebrtc_base.a(webrtc_base.macconversion.o)
duplicate symbol __Z22p_convertCFNumberToIntPK10__CFNumberPi in:
  libjingle.a(libjingle.macconversion.o)
  libwebrtc_base.a(webrtc_base.macconversion.o)
duplicate symbol __Z16p_isCFNumberTruePK10__CFNumber in:
  libjingle.a(libjingle.macconversion.o)
  libwebrtc_base.a(webrtc_base.macconversion.o)
ld: 3 duplicate symbols for architecture x86_64