In particular this makes them more MinGW-friendly: pkg-config on Windows
has specific code to rewrite the ${prefix} when installed in a
different prefix.
[add @datarootdir@, expand commit message -smcv]
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=75858
When targeting Windows, linking against the static library requires
special effort to turn off DLL import/export processing. We normally
link some things against the dynamic library, but if we're not building
that, we'll have to link everything statically.
Based on patches from 'william' on fd.o #46367.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=33973
Tested-by: René Berber <Rene.Berber gmail com>
This does still need to be in configure.ac, because it's common to
dbus/Makefile.am (linking the static/shared library) and dbus-1*.pc.in
(telling static library users which additional libraries they must link).
