setup-emlinux: Add generetad version comment to local.conf

[teradat]

Purpose of pull request

Add EMLinux version and date it was created as comment to local.conf generated by setup-emlinux script.

Example comment added to local.conf:

# The above settings were generated in EMLinux 2.13 on 2026-03-27

Test

Confirmed that comment was added to local.conf with EMLinux version and date.

build@c41625905514:~/work$ . setup-emlinux TEST
You had no conf/local.conf file. This configuration file has therefore been
created for you with some default values. You may wish to edit it to, for
example, select a different MACHINE (target hardware). See conf/local.conf
for more information as common configuration options are commented.

You had no conf/bblayers.conf file. This configuration file has therefore been
created for you with some default values. To add additional metadata layers
into your configuration please add entries to conf/bblayers.conf.

The Yocto Project has extensive documentation about OE including a reference
manual which can be found at:
    http://yoctoproject.org/documentation

For more information about OpenEmbedded see their website:
    http://www.openembedded.org/


### Shell environment set up for builds. ###

You can now run 'bitbake <target>'

Common targets are:
    core-image-minimal
    core-image-sato
    meta-toolchain
    meta-ide-support

You can also run generated qemu images with a command like 'runqemu qemux86'
NOTE: Starting bitbake server...
NOTE: Starting bitbake server...
NOTE: Starting bitbake server...
build@c41625905514:~/work/TEST$ tail -n 1 conf/local.conf
# The above settings were generated in EMLinux 2.13 on 2026-03-27