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Remove obolete case- there aren't fdefns in immobile space #5

Job	Run time
build (--with-sb-thread, x86)	17m 34s
build (--with-sb-thread, x86-64)	17m 31s
build (--without-sb-thread, x86)	19m 42s
build (--without-sb-thread, x86-64)	17m 40s
build (--without-sb-unicode, x86)	18m 45s
build (--without-sb-unicode, x86-64)	17m 40s
build (x86-64, sse4, --with-sb-thread)	30m 13s
build (x86-64, fasteval, --with-sb-fasteval --without-sb-eval)	26m 2s
build (x86-64, --with-mark-region-gc)	19m 6s
	3h 4m 13s

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