subprojects/berkeley-testfloat-3: Update to fix a problem with compiler warnings

subprojects/berkeley-testfloat-3: Update to fix a problem with compiler warnings

Update the berkeley-testfloat-3 wrap to include a patch provided by
Olaf Hering. This fixes a problem with "control reaches end of non-void
function [-Werror=return-type]" compiler warning/errors that are now
enabled by default in certain versions of GCC.

Reported-by: Olaf Hering <olaf@aepfle.de>
Message-Id: <20230816091522.1292029-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit c01196bdddc280ae3710912e98e78f3103155eaf)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>