Fix [f91aa24bbe] for CanvImg and scrollbar #553

Job	Run time
build (gcc)	2m 6s
test (gcc)	4m 0s
test (gcc, --disable-xft)	4m 1s
test (gcc, --enable-symbols)	3m 32s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	6m 27s
build (gcc, --disable-shared)	1m 42s
build (gcc, --disable-xft)	1m 41s
build (gcc, --disable-xss)	1m 43s
build (gcc, --enable-symbols)	1m 16s
build (clang)	1m 49s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 53s
build (clang, --disable-shared)	1m 49s
build (clang, --disable-xft)	1m 50s
build (clang, --disable-xss)	1m 55s
build (clang, --enable-symbols)	1m 26s
	37m 10s

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