pkg.m4 missing in pkg-config v0.28 tool download for GTK+ 3.x on win32

["Legorol" <legorol san gmail com>]

On the Windows 32-bit download page (http://www.gtk.org/download/win32.php), 
under the GTK+ 3.x heading, various "other third party software" are listed. 
One of those is pkg-config version 0.28.

Two download options are available: Tool or Sources. The Tool option links 
to pkg-config_0.28-1_win32.zip. This does not contain share/aclocal/pkg.m4, 
as it should in my opinion. The only way to obtain pkg.m4 is from the 
Sources link.

An inexperienced user, who is just looking to install pkg-config on their 
system in order to use it to build some other package, will not expect to 
have to obtain the source.