It appears that not all testcases are adapted for macos-15 yet, so fo… #1265

Job	Run time
test (gcc)	4m 31s
test (gcc, --disable-xft)	4m 10s
test (gcc, --enable-symbols)	3m 41s
build (gcc)	1m 50s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 52s
build (gcc, --disable-shared)	1m 55s
build (gcc, --disable-xft)	1m 40s
build (gcc, --disable-xss)	1m 45s
build (gcc, --enable-symbols)	1m 22s
build (clang)	2m 4s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 32s
build (clang, --disable-shared)	2m 34s
build (clang, --disable-xft)	1m 54s
build (clang, --disable-xss)	1m 58s
build (clang, --enable-symbols)	1m 25s
	35m 13s

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