Merge 8.7. Fix comment (Tk 9.0 doesn't use CESU-8 internally any more) #1049

Job	Run time
test (gcc)	3m 49s
build (gcc)	1m 34s
test (gcc, --disable-xft)	3m 46s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 31s
test (gcc, --enable-symbols)	3m 17s
build (gcc, --disable-shared)	1m 34s
build (gcc, --disable-xft)	1m 36s
build (gcc, --disable-xss)	1m 36s
build (gcc, --enable-symbols)	1m 45s
build (clang)	2m 13s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 49s
build (clang, --disable-shared)	2m 0s
build (clang, --disable-xft)	1m 48s
build (clang, --disable-xss)	1m 49s
build (clang, --enable-symbols)	1m 34s
	31m 41s

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