[ccan] [PATCH] tools: ccan_depends requires a config.h

[Jeremy Kerr]

Commit a77cc282 causes tools/create-ccan-tree to fail, as it can't build
tools/ccan_depends (via `make tools/ccan_depends`) without a
configuration header present.

This change adds a dependency on config.h, so that the configurator
kicks-in prior to building ccan_depends.o.

Other tools don't need this dependency, as tools/ccan_depends is built
during the Makefile 'include' process.

Signed-off-by: Jeremy Kerr <jeremy.kerr at canonical.com>

---
 tools/Makefile |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/Makefile b/tools/Makefile
index b8871be..4bc7497 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -16,6 +16,8 @@ DEP_OBJS = ccan/grab_file/grab_file.o \
 .PHONY: tools
 tools: $(ALL_TOOLS)
 
+tools/ccan_depends.o: config.h
+
 tools/ccan_depends: tools/ccan_depends.o $(DEP_OBJS)
 
 tools/doc_extract: tools/doc_extract.o tools/doc_extract-core.o $(DEP_OBJS)