Comment # 4 on bug 1160875 from Petr Vorel

Upstream fix works, verified with gcc-10 from devel:gcc and also on Debian
gcc-10, so I'm going to backport it

http://git.linux-nfs.org/?p=steved/libtirpc.git;a=commitdiff;h=daed7eedba73907730241c5262a5c16c7abedb6f;hp=342aa6c11d8dd2cb7cf5c2db5c38e8ccabbb1b24