gitignore: Ignore /config.*

I have one of the autoconf generated files not being ignored,
config.h.in~, it's usual to igore /config.* in one go.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

Author: Damien Lespiau

.gitignore

@@ -28,10 +28,7 @@ cscope.po.out
 stamp-h
 stamp-h.in
 stamp-h1
-/config.h
-/config.h.in
-/config.log
-/config.status
+/config.*
 /configure
 /aclocal.m4
 /autoscan.log