Remove libmysql so container builds in a reasonable amount of time

ecstatic-morse · ecstatic-morse · commit 20cdc39d3e8a · 2019-07-25T10:02:57.000-07:00
`libmysql` pulls in a lot of dependencies (`icu` and every `boost`
module), increasing the image build time by over an hour on Azure
pipelines.
diff --git a/windows/vc-packages.txt b/windows/vc-packages.txt
@@ -1,5 +1,4 @@
 curl
-libmysql
 libpq
 libsodium
 libssh2
