maint: sync .gitignore items with gnulib entries

* .gitignore: Add entries for potentially generated headers.
Also remove a couple of items already present in lib/.gitignore.
* cfg.mk (sc_gitignore_missing): A new syntax check rule to
identify missing .gitignore entries.
(sc_gitignore_redundant): A new syntax check rule to
identify redundant .gitignore entries.
Reported by Tomas Nordin.

1 files changed, 13 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index 885d309bd..86574ecc9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,7 +44,7 @@
 /lib/.gitignore
 /lib/alloca.h
 /lib/arg-nonnull.h
-/lib/arpa
+/lib/arpa/inet.h
 /lib/binary-io.h
 /lib/c++defs.h
 /lib/charset.alias
@@ -53,7 +53,10 @@
 /lib/configmake.h
 /lib/ctype.h
 /lib/dirent.h
+/lib/errno.h
 /lib/fcntl.h
+/lib/float.h
+/lib/fnmatch.h
 /lib/getopt.h
 /lib/glthread
 /lib/iconv.h
@@ -69,17 +72,24 @@
 /lib/locale.h
 /lib/math.h
 /lib/netdb.h
+/lib/netinet/in.h
 /lib/parse-datetime.c
 /lib/printf.c
-/lib/progname.c
-/lib/progname.h
+/lib/pthread.h
 /lib/ref-add.sed
 /lib/ref-del.sed
+/lib/sched.h
+/lib/se-context.h
+/lib/se-selinux.h
 /lib/selinux
 /lib/signal.h
 /lib/spawn.h
 /lib/stamp-h1
 /lib/stdalign.h
+/lib/stdarg.h
+/lib/stdbool.h
+/lib/stddef.h
+/lib/stdint.h
 /lib/stdio.h
 /lib/stdlib.h
 /lib/string.h