Merge remote-tracking branch 'remotes/rth-gitlab/tags/pull-misc-20210315' into staging

Fix qemu_strtosz testsuite failures for i686.

# gpg: Signature made Mon 15 Mar 2021 18:49:12 GMT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth-gitlab/tags/pull-misc-20210315:
  utils: Use fixed-point arithmetic in qemu_strtosz

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>