dynapi_test: improve finding the tests #4657

Job	Run time
linux-cmake	2m 37s
linux (CFLAGS="-O1 -fno-omit-frame-pointer -fsanitize=address -fno-var-tracking" --disable-bindin...	7m 28s
linux (CC="clang")	6m 59s
linux (--enable-release)	10m 17s
macOS	5m 42s
linux (--enable-gcov --disable-bindings --disable-docs CFLAGS="-O0 -g")	5m 37s
linux (--disable-write --disable-docs)	7m 54s
ppc64-big-endian	8m 3s
linux (CFLAGS="-O2 -m32" --disable-bindings --disable-docs)	7m 59s
linux (CFLAGS="-O2 -fno-omit-frame-pointer -fsanitize=undefined -fno-var-tracking" --disable-bind...	10m 16s
mingw	10m 8s
mingw-cmake	3m 37s
mips32-big-endian	9m 39s
vs2019	5m 31s
vs2019-ninja	4m 54s
	1h 46m 41s

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