Fix git fetching with changing postBuffer

While building, you may encounter an error connected with fetching files from gitee.com, with an error message in the log file:

error: RPC failed; curl 56 GnuTLS recv error (-9): Error decoding the received TLS packet.

In order to solve it, try following commands:

git config --global http.postBuffer 1048576000

git config --global https.postBuffer 1048576000