Comment 1 for bug 1991912

Not converting warning to errors is not enough. The s390x build fails now with:

gcc -I. -I. -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -Wno-cast-function-type -Wdate-time -D_FORTIFY_SOURCE=2 -I/usr/local/include -I/usr/include -I/usr/include -I/usr/include -DHAVE_CONFIG_H -Wall -Wextra -Wno-deprecated-declarations -fno-strict-aliasing -fno-omit-frame-pointer -ggdb -Wno-unused-parameter -fPIC -iquote ./tgl -c -MP -MD -MF dep/auto-fetch-ds.d -MQ objs/auto-fetch-ds.o -o objs/auto/auto-fetch-ds.o auto/auto-fetch-ds.c
auto/auto-fetch-ds.c: In function ‘fetch_ds_constructor_bytes’:
auto/auto-fetch-ds.c:450:9: error: ‘struct tl_ds_string’ has no member named ‘f0’
  450 | result->f0 = fetch_ds_type_bare_string (field1);
      | ^~
make[2]: *** [Makefile:57: objs/auto/auto-fetch-ds.o] Error 1

Full log: https://launchpadlibrarian.net/627718716/buildlog_ubuntu-kinetic-s390x.tgl_2.0.1+git20160323.ffb04cac-3ubuntu3_BUILDING.txt.gz