Fix xrbinup script, adjust directory structure for game binaries.

doc/howto/build.txt

@@ -36,9 +36,8 @@ Setup:
 - Install patch 1.6.02 (only for russian locale, worldwide release should have it included):
   http://cop.stalker-game.ru/?page=patches#2
 - Download and unpack archive with libraries
-- Create _bin_dbg, _bin_mix and _bin_rel folders in the game installation directory
-  (Debug, Mixed and Release binaries)
-- Inside each of these folders create Win32 folder (hereinafter '_bin_xxx\Win32' is referred to as 'xbin')
+- Create _bin_dbg_Win32, _bin_mix_Win32 and _bin_rel_Win32 folders in the game installation directory
+  (Debug, Mixed and Release binaries for 32-bit Windows). Hereinafter '_bin_xxx_Win32' is referred to as 'xbin'.
 - Copy following files from bin to xbin:
   - dbghelp.dll
   - eax.dll

xrbinup.cmd

@@ -22,24 +22,33 @@ if not exist %2 (
 )
 set platform=%3
 if %platform%==Win32 (
-) else if %platform%==Win64 (
-) else (
-  echo invalid platform: %platform%
-  goto ret
+  goto platform_ok
+)
+if %platform%==Win64 (
+  goto platform_ok
 )
+echo invalid platform: %platform%
+goto ret
 
+:platform_ok
 set cfg=%4
 if %cfg%==Debug (
   set dst=%1\_bin_dbg
-) else if %cfg%==Mixed (
+  goto cfg_ok
+)
+if %cfg%==Mixed (
   set dst=%1\_bin_mix
-) else if %cfg%==Release (
+  goto cfg_ok
+)
+if %cfg%==Release (
   set dst=%1\_bin_rel
-) else (
-  echo invalid configuration: %cfg%
-  goto ret
+  goto cfg_ok
 )
-set dst=%dst%\%platform%
+echo invalid configuration: %cfg%
+goto ret
+
+:cfg_ok
+set dst=%dst%_%platform%
 set src=%2\bin\%platform%\%cfg%
 
 set cp_tool=cp