Add non-regression test btree-14.3 crashing before the fix in the pre… #657

Job	Run time
test (gcc)	4m 12s
test (gcc, --disable-xft)	4m 12s
test (gcc, --enable-symbols)	3m 42s
build (gcc)	1m 43s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 48s
build (gcc, --disable-shared)	1m 47s
build (gcc, --disable-xft)	2m 15s
build (gcc, --disable-xss)	2m 5s
build (gcc, --enable-symbols)	1m 28s
build (clang)	1m 58s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 59s
build (clang, --disable-shared)	1m 52s
build (clang, --disable-xft)	1m 54s
build (clang, --disable-xss)	2m 10s
build (clang, --enable-symbols)	1m 30s
	34m 35s

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