[gimp] devel-docs: add some .gitignore in reference/ subdirs.

[Jehan <jehanp src gnome org>]

commit aed8573eb95af66f3ac2d75f6a97e6d4aed69da7
Author: Jehan <jehan girinstud io>
Date:   Wed Feb 2 00:16:10 2022 +0100

    devel-docs: add some .gitignore in reference/ subdirs.

 devel-docs/reference/gimp-ui/.gitignore | 2 ++
 devel-docs/reference/gimp/.gitignore    | 2 ++
 2 files changed, 4 insertions(+)
---
diff --git a/devel-docs/reference/gimp-ui/.gitignore b/devel-docs/reference/gimp-ui/.gitignore
new file mode 100644
index 0000000000..b336cc7cec
--- /dev/null
+++ b/devel-docs/reference/gimp-ui/.gitignore
@@ -0,0 +1,2 @@
+/Makefile
+/Makefile.in
diff --git a/devel-docs/reference/gimp/.gitignore b/devel-docs/reference/gimp/.gitignore
new file mode 100644
index 0000000000..b336cc7cec
--- /dev/null
+++ b/devel-docs/reference/gimp/.gitignore
@@ -0,0 +1,2 @@
+/Makefile
+/Makefile.in