Meson test fails on string_array_input_f2py example

[krystophny]

Currenty, the Meson builds fail on example/string_array_input_f2py due to the specific target in the Makefile not compatible with the generic template:

f2py: ${OBJ} ${SIGNATURES}
	CFLAGS="${CFLAGS}" ${F2PY} -c -m _${PY_MOD}_sign ${F2PYFLAGS} ${LINK} ${OBJ} ${SIGNATURES}
	CFLAGS="${CFLAGS}" ${F2PY} -c -m _${PY_MOD}_no_sign ${F2PYFLAGS} ${F90_SRC}

To be able to proceed, I disabled the test in Makefile.meson in #243 until it is resolved. Locally it runs fine with make.