Backport indenting from Tk 9.0 #1492

Job	Run time
build (gcc)	1m 42s
test (gcc)	4m 1s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 42s
test (gcc, --disable-xft)	3m 59s
build (gcc, --disable-xft)	1m 44s
test (gcc, --enable-symbols)	3m 32s
build (gcc, --disable-xss)	1m 42s
build (gcc, --enable-symbols)	1m 12s
build (clang)	2m 12s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 48s
build (clang, --disable-xft)	1m 54s
build (clang, --disable-xss)	2m 19s
build (clang, --enable-symbols)	1m 24s
	29m 11s

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