[Bug libstdc++/104019] Testsuite 17_intro/headers/c++2020/stdc++_multiple_inclusion.cc failures

[rimvydas.jas at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104019

--- Comment #9 from Rimvydas (RJ) <rimvydas.jas at gmail dot com> ---
Also there are more possible teststuite failures when running with:
$  make check-target-libstdc++-v3 -k RUNTESTFLAGS="conformance.exp=17_intro*
--target_board=unix/-Wall/-Wsystem-headers/-Wno-c++11-extensions/-Wno-volatile/-Wno-deprecated-declarations/-Wno-pedantic"

FAIL: 17_intro/headers/c++2011/all_no_exceptions.cc (test for excess errors)
Excess errors:
/tmp/trunk/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/istream.tcc:50:
warning: this 'if' clause does not guard... [-Wmisleading-indentation]
This one is suspicious.