Fix a flaw introduced in e379ea710d6f, leading to incorrect SHAs

The lack of rewriting in some SHAs led to unwanted collisions by which
some pom files in the "assemble" build system were erronously
overwritten. This issue only affected v0.9.2. Now fixed.
Merge pull request #147 from cunei/wip-fixSha

Fix a flaw introduced in e379ea710d6f, leading to incorrect SHAs