[conda] Completely remove "license_file" entry on conda recipe

See bob.devtools#44 and bob.devtools!127
4 jobs for fix_conda_license_file_issue in 5 minutes and 12 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #181234
docker-build
build_linux_36

00:02:44

55.0%
passed #181235
docker-build
build_linux_37

00:02:43

55.0%
passed #181232
macosx
build_macosx_36

00:05:12

55.0%
passed #181233
macosx
build_macosx_37

00:04:47

55.0%