dist/tools/ci: print toolchain version update for esp8266

[gschorcht]

Contribution description

The new ESP8266 port in PR #11108 uses a different tool chain than the previous implementation. The version check must be updated accordingly.

Testing procedure

Without this PR the output of command dist/tools/ci/print_toolchain_versions.sh should either show

   xtensa-lx106-elf-gcc: xtensa-lx106-elf-gcc (crosstool-NG crosstool-ng-1.22.0-60-g37b07f6) 4.8.5
xtensa-lx106-elf-newlib: "2.2.0"

or

   xtensa-lx106-elf-gcc: missing
xtensa-lx106-elf-newlib: missing

With this PR it should show:

   xtensa-esp8266-elf-gcc: xtensa-esp8266-elf-gcc (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a5) 5.2.0
xtensa-esp8266-elf-newlib: "2.2.0"

Issues/PRs references

Needed because of PR #11108

[fjmolinas]

Before install or if running in docker:

    xtensa-esp8266-elf-gcc: missing
    xtensa-esp8266-elf-newlib: missing

After install

    xtensa-esp8266-elf-gcc: xtensa-esp8266-elf-gcc (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a5)    5.2.0
    xtensa-esp8266-elf-newlib: "2.2.0"

[fjmolinas]

I took a quick look at discussion in #11808 and it seem at first you wanted to support both toolchain, but here you remove one of them. Did that change?

[gschorcht]

I took a quick look at discussion in #11808 and it seem at first you wanted to support both toolchain, but here you remove one of them. Did that change?

The old toolchain is no longer needed with the current master. The CI tools should therefore check for the new toolchain and not for the old toolchain.

In the riotdocker image, both versions of the toolchain were simply necessary for the transition from the old ESP8266 port to the new ESP8266 port. But as soon as version 2020.01 is released, I will also remove the old toolchain from riotdocker.

[fjmolinas]

@gschorcht perfect! Thanks for the clarification! ACK!

[fjmolinas]

ACK.

[gschorcht]

@fjmolinas Thanks for reviewing, testing and merging it.