Compiling natively GHC for ARMv7l softabi

[Moritz Angermann]

> 
> "inplace/bin/ghc-stage1" -static  -H32m -O -Wall  -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -this-unit-id rts -optc-DNOSMP -dcmm-lint      -i -irts -irts/dist/build -irts/dist/build/autogen -Irts/dist/build -Irts/dist/build/autogen           -O2     -c rts/StgStartup.cmm -o rts/dist/build/StgStartup.o

run this with `-v`, to check the invorcations. I'm pretty certain some flags to opt/llc are missing/wrong here.