package/polkit: bump version to 126

Drop the -Djs_engine=duktape option as mozjs support has been removed entirely
and as such, the option no longer exists.

Tested with `./support/testing/run-tests tests.package.test_polkit`
Both tests pass.

Also tested with `./utils/test-pkg -p polkit -a`
40 builds, 8 skipped, 0 build failed, 0 legal-info failed, 0 show-info failed

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>