Avoid much of duplication in lists of source files

Don't keep the lists of source files for libglib, libgobject and
libgio in the VS project files in addition to the canonical location,
the corresponding Makefile.am files.

Instead, generate the corresponding .vcproj files at make dist time
using the C preprocessor, from template files called .vcprojin. We
still list explicitly in the .vcprojin files some of the
Windows-specific source files, and the sources files of gnulib and
pcre.

build/win32/vs9/Makefile.am

@@ -3,12 +3,15 @@ EXTRA_DIST = \
 	glib.sln \
 	glib.vsprops \
 	glib.vcproj \
+	glib.vcprojin \
 	glib-genmarshal.vcproj \
 	gspawn-win32-helper-console.vcproj \
 	gspawn-win32-helper.vcproj \
 	gmodule.vcproj \
 	gobject.vcproj \
+	gobject.vcprojin \
 	gthread.vcproj \
 	gio.vcproj \
+	gio.vcprojin \
 	testglib.vcproj \
 	install.vcproj

build/win32/vs9/README.txt

@@ -4,7 +4,8 @@ This VS9 solution and the projects it includes are intented to be used
 in a GLib source tree unpacked from a tarball. In a git checkout you
 first need to use some Unix-like environment or manual work to expand
 the .in files needed, mainly config.h.win32.in into config.h.win32 and
-glibconfig.h.win32.in into glibconfig.h.win32.
+glibconfig.h.win32.in into glibconfig.h.win32. You will also need to
+expand the .vcprojin files here into .vcproj files.
 
 The only external dependency is proxy-libintl. Fetch the latest
 proxy-libintl-dev zipfile from