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>

.gitignore

@@ -14,20 +14,13 @@
 # Normal rules
 #
 *.[oa]
-*.ko
-*.ko.unsigned
-*.ko.out
-*.ko.out.sig
 *.lo
 *.la
-*.mod.c
 *~
 *.swp
-.*.cmd
 .deps
 .libs
 .DS_Store
-modules.order
 Makefile
 Makefile.in