ignore more

Original commit message from CVS:
ignore more

docs/plugins/.gitignore

+Makefile
+Makefile.in
+
+*-decl.txt
+*-decl-list.txt
+*-undocumented.txt
+*-unused.txt
+
+*.args
+*.hierarchy
+*.interfaces
+*.prerequisites
+*.signals
+
+html
+sgml
+xml
+*.stamp