This ensures that the bottom text "Drag the fields from ..." is
visible on all platforms.  Previously this text overlapped with
the data and row field windows on Windows XP.

It's better to use two completely separate source trees than to try to
build two different versions of LibreOffice in the same one

Reduces the build time of the 'moz' module by 30% or so.

It might be a false negative, or something.

Adapt some of the DLL names to match conventions we currently use in a
MinGW build. If those are changed to be exactly like when built with
MSVC (for SDK ABI stability reasons), will have to change here, too.

Bypass stuff that we can't build with MinGW when necessary. Should be
synchronized with the corresponding makefiles, obviously. We can't
currently build the Explorer extension or MSI installer custom actions
with MinGW due to lack of some required headers and/or import
libraries.

Also remove mingwm10.dll stuff. That is an obsolete DLL not used by
current MinGW, says Fridrich.

XColorTable was the last class using this code and it's now based on
XPropertyList instead.