elf2e32 to emit .extern instead of .comm directives for --asm=gas, --dump=a. Interim solution for bugs 3117 and 2979
# A1.var
VARIANT A1
EXTENDS groupA
VIRTUAL
BUILD_INCLUDE append /epoc32/include/A1/build
BUILD_INCLUDE prepend /prepend/include/A1
ROM_INCLUDE prepend /epoc32/include/A1/rom
VARIANT_HRH /epoc32/include/e32std.h