Updated build instructions to not include an absolute line number in clang.cpp to add hard-coded paths.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@43563 91177308-0d34-0410-b5e6-96231b3b80d8

www/get_involved.html

@@ -69,7 +69,9 @@ If you would like to check out and build the project, the current scheme is:<br>
             please follow these instructions:
 	<ul>
 		<li>'<tt>touch empty.c; gcc -v empty.c -fsyntax-only</tt>' to get the path.
-		<li>change clang/Driver/clang.cpp:606 to include that path
+		<li>Look for the comment "FIXME: temporary hack:
+		hard-coded paths" in <tt>Driver/clang.cpp</tt> and
+		change the lines below to include that path.
 	</ul>
 	<li>Build clang</li>
 	<ul>