This partially reverts dc4361f.
As we now ensure that items using GResources and GConstructors are always
referenced so that the linker does not optimize them out in a default
Release build, we no longer need to enforce the use of /LTCG, so
/LTCG:incremental will work as well.
The Visual Studio projects used a default setting for link-time code
generation, which is a part of the various linker optimizations that is
available, which is set as /LTCG for Visual Studio 2013 and earlier.
This changed in Visual Studio 2015 to become /LTCG:incremental, which would
cause GResources-generated code to be optimized out during linking, unless
they were referred to directly in the main line code (such as when the
GResource is manually registered), causing programs to crash as a result as
they can't find the needed code/data at run time.
Fix this by explicitly setting /LTCG for all release builds, for Visual
Studio 2010 and later.
https://bugzilla.gnome.org/show_bug.cgi?id=752837
...where possible, to make application of patches easier in the future.
The README.txt's and the .sln files are still in Windows/DOS line endings
as they need to be so.
Like the Visual Studio 2008 project files, split up the property sheets
so to ease maintenace, and to prepare to use autotools to fill in the
header entries to "install".
Put some of the items that are frequently repeated in the projects as well,
also to simplify maintenance.
Also, update the autotools files to automate the upgrade of Visual Studio
2010 project as we now have multiple property sheets to copy and process.
Build and "install" the gio-querymodules and gdbus utility programs so that
the Visual Studio builds of GLib is more comprehensive. The Python scripts
for the GDBus codegen will be added to "installation" later.
