Eliminate SUPPORT_ADDITIONAL_MOTION_SYNTAX (always 1) too #611

Job	Run time
test (gcc)	4m 0s
build (gcc)	1m 41s
test (gcc, --disable-xft)	4m 12s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 42s
test (gcc, --enable-symbols)	3m 33s
build (gcc, --disable-shared)	1m 35s
build (gcc, --disable-xft)	1m 37s
build (gcc, --disable-xss)	1m 43s
build (gcc, --enable-symbols)	1m 13s
build (clang)	1m 46s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 14s
build (clang, --disable-shared)	1m 51s
build (clang, --disable-xft)	1m 49s
build (clang, --disable-xss)	1m 55s
build (clang, --enable-symbols)	1m 22s
	32m 13s

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