Build with Tcl 8.7 and 9.1 as well #3474

Job	Run time
build (gcc)	1m 59s
test (gcc)	4m 7s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 48s
test (gcc, --disable-xft)	4m 6s
build (gcc, --disable-shared)	1m 46s
test (gcc, --enable-symbols)	4m 1s
build (gcc, --disable-xft)	1m 47s
build (gcc, --disable-xss)	1m 49s
build (gcc, --enable-symbols)	1m 20s
build (clang)	1m 59s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 12s
build (clang, --disable-shared)	2m 31s
build (clang, --disable-xft)	1m 56s
build (clang, --disable-xss)	1m 55s
build (clang, --enable-symbols)	1m 26s
	34m 42s

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