Remove elf2e32 and other mmp references which eclipse the binaries_prebuilt versions from sftools/dev/build
NB. transasm should go as well, but the prebuilt binaries don't have the GCC_SURGE fix yet.
# B2.var
EXTENDS A2
VARIANT B2
BUILD_INCLUDE append /epoc32/include/B1/build
BUILD_INCLUDE prepend /prepend/include/B1
ROM_INCLUDE prepend /epoc32/include/B1/rom