Revert "Disable AVR until we get some warning resolved"

This reverts commit c755624.

Author: btashton

testlist/avr-mips-riscv-x86-xtensa.dat

@@ -1,9 +1,9 @@
 # We do not have a toolchain for avr32 outside of Microchip login wall.
 # The work was never upstreamed to GCC.
 
-#/avr
-#-avr32dev1:nsh
-#-avr32dev1:ostest
+/avr
+-avr32dev1:nsh
+-avr32dev1:ostest
 
 # PINGUINOL toolchain doesn't provide macOS binaries
 # with the same name