[Reproducible-builds] Bug#825643: dash: please make the build reproducible

[HW42]

Hi,

in addition to the sorting problem found by Reiner dash is also not
reproducible since it indirectly captures the shell used as /bin/sh.

The problem is that that dash sets argv[0] to the relative path if
'exec' is called with a relative path and bash sets argv[0] to the
absolute path. When executing 'exec configure' in debian/rules argv[0]
gets captured by the configure script as $srcdir which is later used in
$DEFAULT_INCLUDES and passed to gcc. This leads to different build-ids
depending on the choice of /bin/sh.

The attached patch fix this by simply avoiding the exec call.

Thanks, HW42
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