master
build-sys: (autotools) make dlopen optional
agetty: move man page to agetty-cmd/
all-io: rename read_all/write_all to ul_read_all/ul_write_all
agetty: handle systems without a shell or /bin/login
agetty: fix path_cxt leak in credential loading
tools: switch libsystemd to runtime optional via dlopen
agetty: check ioctl() return value [coverity: CID 503786]
agetty: move fakehost to struct agetty_options