Build with Tcl 8.7 and 9.1 as well #554

Job	Run time
build (gcc)	1m 47s
test (gcc)	4m 8s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 45s
test (gcc, --disable-xft)	4m 20s
build (gcc, --disable-shared)	2m 10s
test (gcc, --enable-symbols)	4m 3s
build (gcc, --disable-xft)	1m 48s
build (gcc, --disable-xss)	2m 23s
build (gcc, --enable-symbols)	1m 50s
build (clang)	1m 57s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 5s
build (clang, --disable-shared)	2m 2s
build (clang, --disable-xft)	1m 57s
build (clang, --disable-xss)	1m 59s
build (clang, --enable-symbols)	1m 27s
	35m 41s

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