ppp: Update to include bug fixes that should be in 2.5.1 but not yet released

ppp: Update to include bug fixes that should be in 2.5.1 but not yet released

- Update from version 2.5.0 to commit e1266c7
- Update of rootfile
- When ppp-2.5.0 was released it had a bug bin it that the lock and run directories
   had non standard defaults but also that if the directory did not exist ppp just
   ignored it and continued to start but would then have error messages in the logs about
   not being able to cretae the lock file
- This issue was raised in the ppp github issues and a set of patches merged into ppp.
- The plan was written in Nov 2023 that this would be released as 2.5.1, however nearly
   three months later there is no sight of 2.5.1 being released and people continue to
   flag up the lock directory issues and have to apply a workaround to create the directory
   in local.rc
- This patch has taken the zip source tarball of master at the commit e1266c7. The zip
   tarball was then extracted and then tar'd back up as a tar.gz file with the version set
   at e1266c7 rather than master. I could not find any other way to get a source tarball\
   created at a certain commit stage.
- The patch ppp-2.5.0-2-everywhere-O_CLOEXEC-harder.patch had to be updated due to some
   changes in the source files.
- The patch ppp-2.5.0-7-add-configure-check-to-see-if-we-have-struct-sockaddr_ll.patch
   was removed as the changes are now built into the source tarball.
- This will need to be tested thoroughly by people with ppp to confirm that the lock
   directory is created if it doesn't exist on the system. I can't test that as I have
   no access to a ppp connection system.
- For a view of the changelog between 2.5.0 and e1266c7 the github commits list needs to
   be reviewed. https://github.com/ppp-project/ppp/commits/master/?before=e1266c76d1ad39f98f11676e34f180f78c5a510c+35

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>