syntax: Remove gnulib "ignore-value.h" in files that don't use it.

Found by 'make syntax-check'.

daemon/proto.c

@@ -37,7 +37,6 @@
 #endif
 
 #include "c-ctype.h"
-#include "ignore-value.h"
 
 #include "daemon.h"
 #include "guestfs_protocol.h"

src/dbdump.c

@@ -34,8 +34,6 @@
 
 #include <pcre.h>
 
-#include "ignore-value.h"
-
 #include "guestfs.h"
 #include "guestfs-internal.h"
 

src/events.c

@@ -29,7 +29,6 @@
 #include <string.h>
 
 #include "c-ctype.h"
-#include "ignore-value.h"
 
 #include "guestfs.h"
 #include "guestfs-internal.h"

src/guestfs.c

@@ -55,7 +55,6 @@
 #include "glthread/lock.h"
 #include "hash.h"
 #include "hash-pjw.h"
-#include "ignore-value.h"
 
 #include "guestfs.h"
 #include "guestfs-internal.h"

src/inspect-apps.c

@@ -34,7 +34,6 @@
 
 #include <pcre.h>
 
-#include "ignore-value.h"
 #include "xstrtol.h"
 
 #include "guestfs.h"

src/inspect-fs-cd.c

@@ -35,7 +35,6 @@
 #include <pcre.h>
 
 #include "c-ctype.h"
-#include "ignore-value.h"
 #include "xstrtol.h"
 
 #include "guestfs.h"

src/inspect.c

@@ -34,7 +34,6 @@
 
 #include <pcre.h>
 
-#include "ignore-value.h"
 #include "xstrtol.h"
 
 #include "guestfs.h"