[CMake] Cross compilation and native executables

[Guillaume Duhamel]

I ended up using a different approach based on ExternalProject:

include(ExternalProject)
ExternalProject_Add(c68kinc
    DOWNLOAD_COMMAND ""
    SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/c68k
    CONFIGURE_COMMAND cmake <SOURCE_DIR>
    INSTALL_COMMAND ""
    BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/c68k
)

Setting CONFIGURE_COMMAND is useless, but the output just
doesn't look right without it.
We tested it for cross compiling a Windows version and a
Dreamcast one and it looks like everything is ok :)

Thanks to both of you Brad and Michael for you help.

Guillaume
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