Subject: Update .gitignore from Debian packaging branch

The Debian packaging git branch contains these updates to the upstream
.gitignore file(s).  This patch is autogenerated, to provide these
updates to users of the official Debian archive view of the package.

[dgit (10.4) update-gitignore]
---
diff --git a/.gitignore b/.gitignore
index b544ac38..30af31e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,59 @@ tmp/
 # Ignore Mac OS X generated file/directory attribute storage files
 \.DS_Store
 \._\.DS_Store
+
+# Quilt patch directory
+/.pc/
+
+# Debian build specific leftovers
+/debian/.debhelper/
+/debian/debhelper-build-stamp
+/debian/files
+/debian/*.debhelper.log
+/debian/*.debhelper
+/debian/*.substvars
+/debian/*.substvars
+/debian/libcsirocsa0/
+/debian/libcsironn0/
+/debian/libplplot-data/
+/debian/libplplot-dev/
+/debian/plplot-examples/
+/debian/libplplot-java/
+/debian/libplplot-lua/
+/debian/libplplot-ocaml-dev/
+/debian/libplplot-ocaml/
+/debian/libplplot17/
+/debian/libplplotada5-dev/
+/debian/libplplotada4.1/
+/debian/libplplotcxx15/
+/debian/libplplotfortran0/
+/debian/libplplotqt2/
+/debian/libplplotwxwidgets1/
+/debian/libqsastime-dev/
+/debian/libqsastime0/
+/debian/octave-plplot/
+/debian/plplot-doc/
+/debian/plplot-driver-cairo/
+/debian/plplot-driver-qt/
+/debian/plplot-driver-wxwidgets/
+/debian/plplot-driver-xwin/
+/debian/plplot-tcl-bin/
+/debian/plplot-tcl-dev/
+/debian/plplot-tcl/
+/debian/plplotada.gpr
+debian/python3-plplot-qt/
+debian/python3-plplot/
+
+# Left over from Tcl binding build
+/obj-*/
+
+# Left over from OCaml binding build
+/ocamlinit-stamp
+
+# This is Debian-specific, until patch install-ada-project.diff is
+# integrated upstream
+/bindings/ada/plplotada.gpr.in
+
+# This is Debian-specific, until patch sip-build-support.patch is
+# integrated upstream
+/bindings/qt_gui/pyqt5/pyproject.toml
