(backport) Merge tkprint-cups branch. Ok by Kevin Walzer #414

Job	Run time
build (gcc)	2m 17s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 49s
build (gcc, --disable-xft)	1m 44s
build (gcc, --disable-xss)	1m 53s
build (gcc, --enable-symbols)	1m 18s
test (gcc)	3m 59s
build (clang)	1m 57s
test (gcc, --disable-xft)	3m 48s
test (gcc, --enable-symbols)	3m 19s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 10s
build (clang, --disable-xft)	2m 14s
build (clang, --disable-xss)	1m 53s
build (clang, --enable-symbols)	1m 28s
	29m 49s

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