FFI: Make FFI call return nil when C function returns NULL Before when a C function returned NULL pointer, an ExternalAddress with address 0 wes returned which required an extra check in a caller to convert it to nil, which would be the customary. This commit automatically converts NULL pointers to Smalltalk `nil` as a courtesy to a Smalltalker.

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@REM make using lcc compiler

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@REM type lccmake, and wait...

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make.exe -N -f bc.mak -DUSELCC=1 %*

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