Don't hardcode path to dot in the doxygen config file.  Let doxygen search the PATH

llvm-svn: 3949
diff --git a/llvm/docs/doxygen.cfg b/llvm/docs/doxygen.cfg
index 9627f8c3..23b0e21 100644
--- a/llvm/docs/doxygen.cfg
+++ b/llvm/docs/doxygen.cfg
@@ -818,7 +818,7 @@
 # The tag DOT_PATH can be used to specify the path where the dot tool can be 
 # found. If left blank, it is assumed the dot tool can be found on the path.
 
-DOT_PATH               = /home/vadve/lattner/bin/
+DOT_PATH               =
 
 # The DOTFILE_DIRS tag can be used to specify one or more directories that 
 # contain dot files that are included in the documentation (see the