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

guowenxue

2019-08-11 44b6985a5c9724e5f8b8f30000c5f022dee42863

 3rdparty/qt/build_QT5.sh

@@ -16,7 +16,7 @@
PRJ_PATH=`pwd`
LIBS_PATH=$PRJ_PATH/../install

QT_INST_PATH=/apps/QT5.9_A8
QT_INST_PATH=/apps/QT5.9_A5

LYFTP_SRC=ftp://master.iot-yun.club/src/