Compile bspatch only on win32 for now.

build/SConscript.main

Index: build/SConscript.main
===================================================================
--- build/SConscript.main	(revision 1854)
+++ build/SConscript.main	(working copy)
@@ -460,7 +460,6 @@
 if LoadComponent('third_party'):
   sconscripts.extend([
       '$BSDIFF_DIR/SConscript',
-      '$BSPATCH_DIR/SConscript',
       '$BZIP2_DIR/SConscript',
       '$ICU38_DIR/SConscript',
       '$LIBJPEG_DIR/SConscript',
@@ -471,6 +470,10 @@
       '$MODP_B64_DIR/SConscript',
       '$ZLIB_DIR/SConscript',
   ])
+  if env['PLATFORM'] == 'win32':
+    sconscripts.extend([
+        '$BSPATCH_DIR/SConscript',
+    ])

[sgk, 2008/09/08 19:13:57]

Picky:  I'd add a comment that this is temporary for porting purposes, so
someone  else trying to read the code doesn't mistakenly think that we
specifically intend that bspatch will only build on Windows.

Otherwise, lgtm.

 
 if LoadComponent('v8') and env.Dir('#/../v8').exists():
   env.SConscript('SConscript.v8',