In stm32f4discovery:posix_spawn and lc823450-xgevk:posix_spawn parallel build, it failed since apps/examples/posix_spawn/filesystem/romfs/hello is not available which is needed by examples/posix_spawn/filesystem/symtab.c. Change-Id: I588317396f8e3ca4d69d4ec8db8ccad219207048 Signed-off-by: liuhaitao <liuhaitao@xiaomi.com>