build system issues

[Claus Reinke]

>>> windres --preprocessor="c:/mingw/bin/gcc -E -xc -DRC_INVOKED" -o
>>> driver/ghci/ghci.res -i driver/ghci/ghci.rc -O coff
>>> c:\MinGW\bin\windres.exe: can't open icon file `ghci.ico': No such file
>>> or directory
>>> make[1]: *** [driver/ghci/ghci.res] Error 1
>>> make: *** [all] Error 2
>>
>>I don't see that error.  
> 
> Note that ghci.ico is in driver/ghci/, not in the directory from which that
> command is being run, and ghci.rc tries to refer to it locally (why not 
> 'cd;windres;cd -' ?).

According to windres docs, the call to windres in driver/ghci/ghc.mk
needs a '-I driver/ghci', so that the 'ghci.ico' referred to can be found.
Adding this avoids the error for my windres (2.16.91 20050827) - 
do newer versions add that directory implicitly?

Claus