[PATCH v3] Shorter object file names under subdir-objects

[Thomas Martitz]

Hello,

huge thanks for your review thus far.

I have reworked the patch, making most of your remarks moot. I have 
incorporated the remaining ones.

Change since v2:
- I changed the logic to first collect the targets via am_install_var, 
then scan for duplicated names (by the new handle_targets function), and 
then call handle_programs etc.
- The whole truncation is now done after the blacklist check is succeeds 
(before the blacklist check was done last)
- I changed the truncation logic itself to only truncate at directory 
boundaries (before it could truncate in the middle if a path component 
contained underscores), and also simplified it.
- I refactored the test to be better readable and added a case for a 
clash between a program and a library.
- I changed to commit message and NEWS item according to your suggestions


Please review!

Best regards.

0001-Shorter-object-file-names-under-subdir-objects.patch
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