Put back "none" as possible index value for Tk > 8 #324

Job	Run time
build (gcc)	1m 41s
test (gcc)	4m 11s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 53s
test (gcc, --disable-xft)	3m 50s
build (gcc, --disable-shared)	1m 38s
test (gcc, --enable-symbols)	3m 19s
build (gcc, --disable-xft)	1m 39s
build (gcc, --disable-xss)	1m 39s
build (gcc, --enable-symbols)	1m 15s
build (clang)	2m 26s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 55s
build (clang, --disable-shared)	1m 44s
build (clang, --disable-xft)	1m 50s
build (clang, --disable-xss)	1m 58s
build (clang, --enable-symbols)	1m 27s
	32m 25s

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