Bug#985187: ffmpeg: reproducible builds: Embeds build path in binaries generated with cl2c

[James Addison <jay@jp-hosting.net>]

Source: ffmpeg
Followup-For: Bug #985187
X-Debbugs-Cc: vagrant@reproducible-builds.org
Control: fixed -1 7:6.1-1
Control: close -1

This package is not yet building reproducibly[1], but the build-path embed
correctly identified by this bugreport as a contributing factor has been
removed[2] from ffmpeg v6.1 onwards and no longer adds variance to built
packages.

[1] - https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/ffmpeg.html

[2] - https://git.ffmpeg.org/gitweb/ffmpeg.git/blobdiff/7cfd7e4af4b1c0f280f0c64a8088d362a2917e79:/tools/cl2c..88e2cca3dbd1f509982778804ba2463058bb729a:/tools/source2c