libmicrohttpd: upgraded package to upstream

Upgraded net-libs/libmicrohttpd to version 0.9.72 on amd64, arm

BUG=b:194342674
TEST=Built image and tested local api

Cq-Depend: 3059532, 3060429, 3092165
Change-Id: Ia0f21b4b0ef018ee6f83b8481ce77b8532cb1492
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3058456
Tested-by: Pranav Batra <batrapranav@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Pranav Batra <batrapranav@chromium.org>
7 files changed