gitignore: anchor entries at their respective directory

.ko is specific to module, .m4 to config, etc.

Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

module/.gitignore

@@ -1,3 +1,11 @@
+*.ko
+*.ko.unsigned
+*.ko.out
+*.ko.out.sig
+*.mod.c
+.*.cmd
+modules.order
+
 /.tmp_versions
 /Module.markers
 /Module.symvers