Description:	Check for file/symlink existence before trying to use it in Java().
Upstream bug:	http://scons.tigris.org/issues/show_bug.cgi?id=2207
Debian bug:	http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=338232

Index: scons-1.1.0/engine/SCons/Tool/javac.py
===================================================================
--- scons-1.1.0.orig/engine/SCons/Tool/javac.py	2008-10-11 18:11:46.083270910 +0200
+++ scons-1.1.0/engine/SCons/Tool/javac.py	2008-10-11 18:13:04.519739110 +0200
@@ -94,6 +94,8 @@
     version = env.get('JAVAVERSION', '1.4')
     full_tlist = []
     for f in slist:
+        if not os.path.exists(f.rfile().get_abspath()):
+            continue
         tlist = []
         source_file_based = True
         pkg_dir = None