Makefile: fix occasional race where we fail to compile tools/tests. #2962
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This simplifies the dependencies:
The particular problem in this case seems to be that make would use
tools/test/gen_test.c before it was ready. It's probably confused by
the use of recursive make via update-mocks, so explicitly split that
into two stages.
Signed-off-by: Rusty Russell rusty@rustcorp.com.au