Remove 'sed' dependency on Windows
Remove 'sed' dependency on Windows

Change build.ninja internally, without calling 'sed'. Unfortunately
this makes the code uglier and less elegant than before ...

autopulated/yotta,ntoll/yotta,theotherjimmy/yotta,iriark01/yotta,iriark01/yotta,theotherjimmy/yotta,stevenewey/yotta,ARMmbed/yotta,ntoll/yotta,autopulated/yotta,stevenewey/yotta,eyeye/yotta,eyeye/yotta,ARMmbed/yotta,BlackstoneEngineering/yotta,BlackstoneEngineering/yotta,bridadan/yotta,bridadan/yotta