porting obsd userland code to run under linux & musl libc...
* 731c3aa usr.bin/mail: dont use uid_from_user()
* a37d400 usr.bin/mail: fix yet another implicit use of time.h
* 7351d56 usr.bin/mail: use ifdef for ALTWERASE
* 40f5e5e usr.bin/mail: fix another implicit use of time.h
* f68a55e usr.bin/mail: fix implicit use of <sys/file.h>
* f07cade usr.bin/mail: fix implicit use of time.h
* db80de8 usr.bin/mail: import new code from OBSD 7.2
* 9afee35 usr.bin/indent: import new version via OBSD 7.2