Commit [dec7b9] Maximize Restore History

Autotools: always put object files in the source file's directory

Enable Automake option "subdir-object" to put all object files next to
their source file rather than in the directory containing the Makefile.

This is quite expected, and will be the future behavior of Automake in
all cases, so enabling it now avoids future unexpected change.

Colomban Wendling Colomban Wendling 2013-12-17

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