Patch collection from Volker Grabsch to help Tux Paint cross-compile for Windows:

* Solve the 'FIXME: "finddir" ...' (The trick is to use "=" instead of ":=". That way, $(beos_PREFIX) will only be evaluated when it is actually used.)
* include "shlwapi.h" instead of "Shlwapi.h" (Otherwise, compiling for Windows will fail on a case sensitive file system. (e.g. a Unix file system when cross compiling))
* use FILENAME_MAX instead of NAME_MAX (FILENAME_MAX is more portable than NAME_MAX. Also, recent MinGW versions don't support NAME_MAX anymore.)
* Exposing font_thread_aborted via extern [tweak to Volker's patch which removed a logic test, which is probably not what we want]
* include parse.h (and thus compiler.h) after <stdio.h> (This ensures that the perror() macro of compiler.h won't confuse the perror() function declaration of <stdio.h>.)
* fix another compiling error about undefined variables (The tuxpaint.c uses printcommand/altprintcommand/papersize even when they aren't defined, i.e. when libpaper is not used. This patch solves the issue by using "#ifdef PAPER_H")
* call show_available_papersizes() only when libpaper is used
* permit cross compiling by using Make variables instead of hard-coded tools

Documented scottmc's Haiku improvements.

src/compiler.h

@@ -24,7 +24,7 @@
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   (See COPYING.txt)
 
-  June 14, 2002 - February 18, 2006
+  June 14, 2002 - February 24, 2010
   $Id$
 */
 
@@ -52,7 +52,7 @@
   WIN32 and MINGW don't have strcasestr().
 */
 #define NOMINMAX
-#include "Shlwapi.h"
+#include "shlwapi.h"
 #define strcasestr StrStrI
 #endif /* WIN32 */