check: make sure all files outside contrib/ include "config.h" first.

And turn "" includes into full-path (which makes it easier to put
config.h first, and finds some cases check-includes.sh missed
previously).

config.h sets _GNU_SOURCE which really needs to be done before any
'#includes': we mainly got away with it with glibc, but other platforms
like Alpine may have stricter requirements.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

plugins/autoclean.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <ccan/array_size/array_size.h>
 #include <common/json_tok.h>
 #include <plugins/libplugin.h>

plugins/bcli.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/base58.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/cast/cast.h>

plugins/fetchinvoice.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/cast/cast.h>

plugins/funder_policy.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <assert.h>
 #include <bitcoin/script.h>
 #include <ccan/tal/str/str.h>

plugins/keysend.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <ccan/array_size/array_size.h>
 #include <ccan/asort/asort.h>
 #include <ccan/tal/str/str.h>

plugins/libplugin-pay.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <ccan/array_size/array_size.h>
 #include <ccan/tal/str/str.h>
 #include <common/dijkstra.h>

plugins/libplugin.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <bitcoin/privkey.h>
 #include <ccan/io/io.h>

plugins/offers.c

@@ -1,4 +1,5 @@
 /* This plugin covers both sending and receiving offers */
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/cast/cast.h>

plugins/offers_inv_hook.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <ccan/mem/mem.h>
 #include <ccan/tal/str/str.h>
 #include <common/bolt12_merkle.h>

plugins/offers_invreq_hook.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <bitcoin/preimage.h>
 #include <ccan/tal/str/str.h>

plugins/offers_offer.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/tal/str/str.h>

plugins/pay.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <ccan/array_size/array_size.h>
 #include <ccan/asort/asort.h>

plugins/spender/fundchannel.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <ccan/array_size/array_size.h>
 #include <common/json_stream.h>
 #include <common/json_tok.h>

plugins/spender/main.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <plugins/spender/fundchannel.h>
 #include <plugins/spender/multifundchannel.h>
 #include <plugins/spender/multiwithdraw.h>

plugins/spender/multiwithdraw.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/chainparams.h>
 #include <bitcoin/psbt.h>
 #include <ccan/array_size/array_size.h>

plugins/test/run-funder_policy.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include "../funder_policy.c"
 #include <ccan/array_size/array_size.h>
 #include <common/setup.h>

plugins/test/run-route-overlong.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include "../libplugin-pay.c"
 #include <bitcoin/chainparams.h>
 #include <common/gossip_store.h>

plugins/topology.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <ccan/array_size/array_size.h>
 #include <ccan/crypto/siphash24/siphash24.h>
 #include <ccan/htable/htable_type.h>

plugins/txprepare.c

@@ -1,3 +1,4 @@
+#include "config.h"
 #include <bitcoin/psbt.h>
 #include <ccan/array_size/array_size.h>
 #include <common/addr.h>