Remove ghcii.sh

On Windows we have an extra script ghcii.sh that is recommended when we run in a console that does not use conhost. e.g mintty from msys2 or the cygwin shell.

This is because the sigINT signal is being swallowed by these consoles.

I believe we can work around this by listening to Window messages as well. These consoles do their own drawings, which means they load gdi32.dll.

Which means they have a message pump so should be receiving Window events. See https://msdn.microsoft.com/en-us/library/windows/desktop/ms686016(v=vs.85).aspx

Trac metadata

Trac field	Value
Version	8.0.1
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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