unit-tests: wrong attdef errormsg #4689

Job	Run time
linux-cmake	1m 52s
mips32-big-endian	9m 6s
ppc64-big-endian	8m 10s
linux (CFLAGS="-O1 -fno-omit-frame-pointer -fsanitize=address -fno-var-tracking" --disable-bindin...	3m 38s
linux (CC="clang")	5m 23s
linux (--enable-release)	34m 44s
linux (--enable-gcov --disable-bindings --disable-docs CFLAGS="-O0 -g")	5m 21s
macOS	6m 53s
linux (--disable-write --disable-docs)	5m 37s
mingw	30m 36s
linux (CFLAGS="-O2 -m32" --disable-bindings --disable-docs)	4m 21s
mingw-cmake	3m 27s
linux (CFLAGS="-O2 -fno-omit-frame-pointer -fsanitize=undefined -fno-var-tracking" --disable-bind...	8m 32s
vs2019	6m 11s
vs2019-ninja	4m 46s
	2h 18m 37s

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