Visual Studio projects: "Add" Visual Studio 2022 projects

Like the Visual Studio 2012+ projects, copy the Visual Studio 2010
projects and replace the items in there as needed, so that we can
obtain Visual Studio 2022 project files, since they are all in the
MSBuild format.

win32/vs17/Makefile.am

@@ -0,0 +1,52 @@
+include $(top_srcdir)/Makefile.decl
+
+EXTRA_DIST +=	\
+	README.txt	\
+	gtk+.sln	\
+	gtk3-prebuild.vcxproj	\
+	gdk3-win32.vcxproj	\
+	gdk3-win32.vcxproj.filters	\
+	gdk-3.vcxproj	\
+	gdk-3.vcxproj.filters	\
+	gtk-3.vcxproj	\
+	gtk-3.vcxproj.filters	\
+	gtk-builder-tool.vcxproj		\
+	gtk-builder-tool.vcxproj.filters	\
+	gtk-encode-symbolic-svg.vcxproj	\
+	gtk-encode-symbolic-svg.vcxproj.filters	\
+	gtk-query-settings.vcxproj		\
+	gtk-query-settings.vcxproj.filters	\
+	gtk-update-icon-cache.vcxproj		\
+	gtk-update-icon-cache.vcxproj.filters	\
+	gtk3-demo.vcxproj	\
+	gtk3-demo.vcxproj.filters	\
+	gtk3-demo-application.vcxproj	\
+	gtk3-demo-application.vcxproj.filters	\
+	gtk3-icon-browser.vcxproj	\
+	gtk3-icon-browser.vcxproj.filters	\
+	gailutil-3.vcxproj	\
+	gailutil-3.vcxproj.filters	\
+	gtk3-install.vcxproj	\
+	gtk3-install.vcxproj.filters	\
+	gtk3-introspect.vcxproj		\
+	broadwayd.vcxproj	\
+	broadwayd.vcxproj.filters	\
+	gdk3-broadway.vcxproj	\
+	gdk3-broadway.vcxproj.filters	\
+	gtk3-build-defines.props	\
+	gtk3-copy-gdk-broadway.props	\
+	gtk3-gen-srcs.props	\
+	gtk3-ignore-broadway.props	\
+	gtk3-install.props	\
+	gtk3-version-paths.props
+
+DISTCLEANFILES = $(EXTRA_DIST)
+
+MSVC_VER = 17
+MSVC_VER_LONG = 17
+MSVC_TOOLSET = 143
+MSVC_FORMAT_VER = 12
+
+include $(top_srcdir)/win32/Makefile-newvs.am
+
+-include $(top_srcdir)/git.mk