This is fixed by adding libmariadbclient-dev-compat to the build dependencies. I'm not sure why this is needed now.
diff -ur debian.orig/control debian/control --- debian.orig/control 2016-12-23 16:05:31.000000000 +0100 +++ debian/control 2017-01-06 16:21:18.000000000 +0100 @@ -11,7 +11,7 @@ kdelibs5-dev (>= 4:4.8.4), libmtp-dev (>= 1.0.0), libqjson-dev, libglib2.0-dev, libgpod-nogtk-dev (>= 0.7.0) | libgpod-dev (>= 0.7.0), - libmariadbd-dev, + libmariadbd-dev, libmariadbclient-dev-compat, libwrap0-dev, libcurl4-gnutls-dev, libxml2-dev, libloudmouth1-dev, libgtk2.0-dev, libqca2-dev, liblastfm-dev (>= 1.0.3),
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