Provide an option for the base/rom extension that causes the toolchain id (ARMCC or GCCE) to be defined for the C preprocessor phase of rombuild, enabling rom files to be conditionally included or excluded depending on whether the toolchain can build them. This mimics the same change for Beagleboard.

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#

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# QEMU SYBORG ESTART.TXT

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#

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D:  0  ELOCAL  FAT   0       FS_FORMAT_COLD,FS_SYNC_DRIVE       # IRAM

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C:  1  ELOCAL  FAT   0       FS_FORMAT_CORRUPT,FS_NOT_RUGGED    # NVMEM

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