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
Make use of the common autotools module that is used to generate the MSVC
project files from their respective templates so that the main build files
beccome cleaner, and enhance them in a way that the headers that should be
installed can be written to the property sheets during 'make dist', so that
the chances of missing headers for MSVC builds can be greatly reduced.
Also use this autotools module to fill in the projects for
glib-compile-schemas and glib-compile-resources.
https://bugzilla.gnome.org/show_bug.cgi?id=735429
