Win32 build (& doc) tweaks

TOYAMA Shin-ichi noticed that when building for Win32 under mingw/msys,
an #include of "librsvg-cairo.h" was also necessary.

He also bumped the version # in win32/resources.rc
(and I put his credit in there).

I updated docs/RELEASE.txt to mention that .rc file also needing
updated when preparing a new release.

docs/CHANGES.txt

@@ -8,7 +8,7 @@ http://www.tuxpaint.org/
 
 $Id$
 
-2020.April.1 (0.9.24)
+2020.April.10 (0.9.24)
   * New tools
     ---------
     * Fill
@@ -35,6 +35,9 @@ $Id$
       and made sure some warnings and errors were going to
       STDERR, rather than STDOUT.
 
+    * Updates to build for Windows (using mingw/msys)
+      TOYAMA Shin-ichi <shin1@wmail.plala.or.jp>
+
   * Other Improvements
     ------------------
     * Added ability to move color palette options to the end of

docs/RELEASE.txt

@@ -7,8 +7,9 @@ cutting a release (tagging in the source code repository, and running
  * Makefile
 
  * Build description files:
-   * tuxpaint.spec (RPM package)
+   * tuxpaint.spec (Linux RPM package)
    * macos/Info.plist (macOS build)
+   * win32/resources.rc (Windows mingw/msys build)
 
  * Documentation
    (For HTML variants, be sure to run "make" in "docs/", to

docs/en/README.txt

@@ -6,7 +6,7 @@
           Copyright 2002-2020 by various contributors; see AUTHORS.txt
                             http://www.tuxpaint.org/
 
-                         June 14, 2002 - April 1, 2020
+                         June 14, 2002 - April 10, 2020
 
      ----------------------------------------------------------------------
 

docs/en/html/README.html

@@ -22,7 +22,7 @@ version
 
 <p>June 14, 2002 -
 
-					April 1, 2020</p>
+					April 10, 2020</p>
 
 </center>