...the same way cpp_uno/mingw_intel was already adapted.

...for reasons that are yet unclear to me.

Apparently the order in makefile.mk matters. Without this higher,
acceptor.uno.dll does not get built.

shasum is only needed to detect a bug in some version of gnumkae
do not burden platform with a non-impacted gnu make with
that requirement

Hmm, /usr/bin/shasum is a Perl implementation (!), should we use
"openssl sha1" instead?

Cairo canvas is a LO feature, it doesn't make sense to use system cairo
only if the feature is enabled. Fixes mingw build (where our cairo copy
does not build for whatever reason).

Fix this as soon as possible with a clean fix

See comment in callvirtualmethod.cxx for details.