[ccan] A couple patches to make tools/ccan_depends --compile work.

[Joseph Adams]

tools/ccan_depends --compile didn't work because _info files are
compiled in /tmp/..., but they include "config.h".  The first patch
adds "-I." to the compile switches for _info so it works now.

The second patch fixes a segfault when the slash is omitted in the
module directory:

$ tools/ccan_depends ccan/talloc
Segmentation fault


Thanks!
- Joey Adams
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