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.
# b1a.var
EXTENDS A1
VARIANT B1A
BUILD_INCLUDE append epoc32\include\B1\build
BUILD_INCLUDE prepend /prepend/include/B1
ROM_INCLUDE prepend /epoc32/include/B1/rom
VARIANT_HRH \epoc32/include/e32cmn.inl