"canvas" almost done. Only missing are tkCanvPs and tkCanvWind #3389

Job	Run time
build (gcc)	1m 42s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 37s
build (gcc, --disable-shared)	1m 41s
build (gcc, --disable-xft)	1m 43s
build (gcc, --disable-xss)	1m 42s
test (gcc)	4m 15s
build (gcc, --enable-symbols)	1m 12s
test (gcc, --disable-xft)	4m 0s
build (clang)	1m 51s
test (gcc, --enable-symbols)	3m 56s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 47s
build (clang, --disable-shared)	1m 52s
build (clang, --disable-xft)	1m 53s
build (clang, --disable-xss)	1m 57s
build (clang, --enable-symbols)	1m 25s
	32m 33s

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