Description

While doing some tests for the release, I noticed that the gnrc_minimal example
doesn't work anymore in AVR platforms. I tested for the 2017.10 release and
it works. I tried to bisect and fell into the netif2 commits, and git bisect cannot
help there anymore. It is broken since 2018.01.

Steps to reproduce the issue

Compile and test gnrc_minimal for any atmega platform. I'm using right now the
xbee and will test with other radios. The only I have currently is the mrf24j40.

Expected results

The example prints the address and you can ping it.

Actual results

The address is printed but you cannot ping it. I also put a while (1) {} which is
needed to avoid the node to kill all processes, as stated in #6526 .

Versions

Installed compiler toolchains

         native gcc: Apple LLVM version 8.0.0 (clang-800.0.42.1)
  arm-none-eabi-gcc: arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 7-2017-q4-major) 7.2.1 20170904 (release) [ARM/embedded-7-branch revision 255204]
            avr-gcc: avr-gcc (GCC) 7.3.0
   mips-mti-elf-gcc: missing
         msp430-gcc: msp430-gcc (GCC) 4.7.0 20120322 (mspgcc dev 20120911)

riscv-none-embed-gcc: missing
clang: Apple LLVM version 8.0.0 (clang-800.0.42.1)

Installed compiler libs

arm-none-eabi-newlib: "2.5.0"
mips-mti-elf-newlib: missing
riscv-none-embed-newlib: missing
avr-libc: "2.0.0" ("20150208")

Installed development tools

              cmake: cmake version 3.11.0
           cppcheck: missing
            doxygen: missing
             flake8: missing
                git: git version 2.17.0
         coccinelle: missing

I have tagged it for the release just to not forget to put it as a known issue.