test/bioprinttest.c: silence more width/precision checks

test/bioprinttest.c: silence more width/precision checks

Apparently, old glibc also can't handle width/precision specifiers;
silence the checks that test for it by setting .skip_libc_check to 1.

Fixes: a29d157fdb6d "Replace homebrewed implementation of *printf*() functions with libc"
Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28530)