.gitignore: Ignore intermediate files

We should prevent Git from tracking patch files generated by
'git format-patch' and other commands, as they are typically
intermediate files.

Link: https://lore.kernel.org/all/CA+5PVA7h92wEmJOPVbH-9ubsssPFPwGuRYPNvg54_kTmk8o0Lg@mail.gmail.com
Signed-off-by: WangYuli <wangyuli@uniontech.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

.gitignore

@@ -3,3 +3,8 @@ dist/
 release/
 contrib/*.db
 contrib/*.txt
+
+# Normal intermediate files
+*.orig
+*.patch
+*.rej