update pppd patch and build shell script, fix buildroot glibc build bug

guowenxue

2019-08-11 44b6985a5c9724e5f8b8f30000c5f022dee42863

 3rdparty/ffmpeg/build.sh

@@ -83,9 +83,7 @@
    check_result "ERROR: compile ${SRC_NAME} failure"

    ${STRIP} ${IMG_NAME}
    #${STRIP} ffserver
    #cp ${IMG_NAME} ${PREFIX_PATH}
    #cp ffserver ${PREFIX_PATH}
    cp ${IMG_NAME} ${PREFIX_PATH}

    cd -
}