Webrtc adding third-party libraries

webrtc Add a third-party library when compiling , This article takes android End increase openssl Static library as an example ：    

if (is_android) {
    lib_dirs = [ "//rtc_base/openssl/android" ]  // Static inventory path
    libs = ["ssl","crypto",] //libssl.a and libcrypto.a
    }

Get it done ！