esp8266: toolchain update for the new RTOS SDK #93
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This PR adds a new ESP8266 toolchain that uses a newer GCC version and the new ESP8266 RTOS SDK instead of the old ESP8266 NONOS SDK. It is required for the reimplementation of the ESP8266 RIOT port in PR RIOT-OS/RIOT#11108.
This new toolchain is installed in parallel to the old one to be able to compile the current master but also to compile the PR RIOT-OS/RIOT#11108. Once PR RIOT-OS/RIOT#11108 is merged, the old toolchain can be removed.
The additional environment variable settings for the old toolchain are required to be able to divide the toolchain in RIOT's build system.