MSVC Builds: "Add" MSVC 2015 Projects

This "adds" the Visual Studio 2015 Project files by doing what we did
before: copying the Visual Studio 2010 projects and replacing items
in them, as the formats of the Visual Studio 201x projects are largely
the same.

build/win32/Makefile.am

@@ -3,7 +3,8 @@ SUBDIRS = 	\
 	vs9     \
 	vs10	\
 	vs11	\
-	vs12
+	vs12	\
+	vs14
 
 EXTRA_DIST = 		\
 	make.msc 	\

build/win32/vs14/Makefile.am

@@ -0,0 +1,44 @@
+EXTRA_DIST = \
+	README.txt \
+	glib.sln \
+	glib.vcxproj \
+	glib.vcxproj.filters \
+	glib-genmarshal.vcxproj \
+	glib-genmarshal.vcxproj.filters \
+	gspawn-win32-helper-console.vcxproj \
+	gspawn-win32-helper-console.vcxproj.filters \
+	gspawn-win32-helper.vcxproj \
+	gspawn-win32-helper.vcxproj.filters \
+	gmodule.vcxproj \
+	gmodule.vcxproj.filters \
+	gobject.vcxproj \
+	gobject.vcxproj.filters \
+	gthread.vcxproj \
+	gthread.vcxproj.filters \
+	gio.vcxproj \
+	gio.vcxproj.filters \
+	glib-compile-schemas.vcxproj \
+	glib-compile-schemas.vcxproj.filters \
+	gsettings.vcxproj \
+	gsettings.vcxproj.filters \
+	glib-compile-resources.vcxproj \
+	glib-compile-resources.vcxproj.filters \
+	gresource.vcxproj \
+	gresource.vcxproj.filters \
+	gio-querymodules.vcxproj \
+	gio-querymodules.vcxproj.filters \
+	gdbus.vcxproj \
+	gdbus.vcxproj.filters \
+	glib-install.vcxproj	\
+	glib-build-defines.props	\
+	glib-install.props	\
+	glib-version-paths.props	\
+	glib-gen-srcs.props
+
+DISTCLEANFILES = $(EXTRA_DIST)
+
+MSVC_VER = 14
+MSVC_FORMAT_VER = 12
+MSVC_VER_LONG = 14
+
+include $(top_srcdir)/build/Makefile-newvs.am

configure.ac

@@ -3570,6 +3570,7 @@ build/win32/vs10/Makefile
 build/win32/vs10/glib-gen-srcs.props
 build/win32/vs11/Makefile
 build/win32/vs12/Makefile
+build/win32/vs14/Makefile
 glib/Makefile
 glib/glib.stp
 glib/libcharset/Makefile