Auto merge of #2279 - alexcrichton:rerun-if-changed-rust-file, r=brson
There was a failure mode of the handling of the rerun-if-changed directive where
it would rerun the build script twice before hitting a steady state of actually
processing the directives. The order of events that led to this were:
1. A project was built from a clean directory. Cargo recorded a fingerprint
indicating this (for the build script), but the fingerprint indicated that
the build script was a normal build script (no manually specified inputs)
because Cargo had no prior knowledge.
2. A project was then rebuilt from the same directory. Cargo's new fingerprint
for the build script now indicates that there is a custom list of
dependencies, but the previous fingerprint indicates there wasn't, so the
mismatch causes another rebuild.
3. All future rebuilds will agree that there are custom lists both before and
after, so the directives are processed as one would expect.
This commit does a bit of refactoring in the fingerprint module to fix this
situation. The recorded fingerprint in step (1) is now recorded as a "custom
dependencies are specified" fingerprint if, after the build script is run,
custom dependencies were specified.