.gitignore: add auto-generated /include/[s|t]pl-autoconf.mk

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

.gitignore

@@ -60,6 +60,8 @@
 /reloc_off
 
 /include/generated/
+/include/spl-autoconf.mk
+/include/tpl-autoconf.mk
 asm-offsets.s
 
 # stgit generated dirs