Linux

No longer use -Wl,-single_module linker flag: it's deprecated #3483

Job	Run time
build (gcc)	2m 3s
test (gcc)	4m 1s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 41s
test (gcc, --disable-xft)	4m 26s
build (gcc, --disable-shared)	1m 41s
test (gcc, --enable-symbols)	3m 30s
build (gcc, --disable-xft)	1m 45s
build (gcc, --disable-xss)	1m 52s
build (gcc, --enable-symbols)	1m 36s
build (clang)	1m 56s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 4s
build (clang, --disable-shared)	2m 13s
build (clang, --disable-xft)	1m 54s
build (clang, --disable-xss)	2m 30s
build (clang, --enable-symbols)	1m 25s
	34m 37s

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