.gitignore: Do not track defconfig from make savedefconfig

Running `make savedefconfig` creates by default `defconfig`, which is,
currently, on git’s radar, for example, `git status` lists this file as
untracked.

So, add the file to `.gitignore`, so it’s ignored by git.

Signed-off-by: Paul Menzel <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

Author: paulmenzel

.gitignore

@@ -143,6 +143,9 @@ x509.genkey
 /allrandom.config
 /allyes.config
 
+# Kconfig savedefconfig output
+/defconfig
+
 # Kdevelop4
 *.kdev4