Make sure that 'clean' target is not failed in 'po' subdir.
Make sure that 'clean' target is not failed in 'po' subdir.

ghaderer/libmicrohttpd,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2