Removed unused variable "log".

Fixed the llvm build for Mac OS X builds to look in llvm/lib/Release+Asserts 
output directory for all configurations (Debug, Release, BuildAndIntegration).

llvm-svn: 108289
diff --git a/lldb/scripts/build-llvm.pl b/lldb/scripts/build-llvm.pl
index d0f3078..aaf7d8e 100644
--- a/lldb/scripts/build-llvm.pl
+++ b/lldb/scripts/build-llvm.pl
@@ -395,6 +395,10 @@
                 print FILES "$archive_fullpath\n";
             }
 		}
+        else
+        {
+            print "warning: archive doesn't exist: '$archive_fullpath'\n";
+        }
 	}
 	close (FILES);
     do_command ("libtool -static -o '$arch_output_file' -filelist '$files'");