Make ghc.mk compatible with pedantic /bin/sh impls
This fixes `for`-loops introduced via 64761ce9 which can result in `for i in ;` which some `/bin/sh` implementations don't like.
This fixes `for`-loops introduced via 64761ce9 which can result in `for i in ;` which some `/bin/sh` implementations don't like.
mentioned in commit cd10a232
·mentioned in commit cd10a232