Gcc7.5 <rpc/xdr.h> issue

[Florian Weimer]

* Aditya via Gcc-help:

> This is regarding gcc7.5 rpc header
>
> We are trying install gcc7.5 version for RHEL8 os and receiving below error
> message.

You may have to install the libtirpc-devel development package (or
disable building the sanitizers).

Thanks,
Florian