extend .gitignores for more ppremake files

direct/.gitignore

@@ -1,5 +1,8 @@
 *.pyc
 /__init__.py
-/built/
+# These are files that are generated within the source tree by the
+# ppremake system.
 Makefile
 pp.dep
+/built/
+Opt?-*

dtool/.gitignore

@@ -1,4 +1,7 @@
-/built/
 /dtool_config.h
+# These are files that are generated within the source tree by the
+# ppremake system.
 Makefile
 pp.dep
+/built/
+Opt?-*

panda/.gitignore

@@ -1 +1,7 @@
 *.pyc
+# These are files that are generated within the source tree by the
+# ppremake system.
+Makefile
+pp.dep
+/built/
+Opt?-*

pandatool/.gitignore

@@ -1,3 +1,6 @@
-/built/
+# These are files that are generated within the source tree by the
+# ppremake system.
 Makefile
 pp.dep
+/built/
+Opt?-*