* inet/ruserpass.c (ruserpass): Rename __secure_getenv to
secure_getenv.
* malloc/mtrace.c (mtrace): Likewise.
* sysdeps/mach/hurd/tmpfile.c (__tmpfile): Likewise.
* sysdeps/posix/libc_fatal.c (__libc_fatal): Likewise. Update
copyright years.
* sysdeps/posix/sysconf.c (__sysconf__check_spec): Likewise.
* sysdeps/posix/tempname.c: Likewise. Evaluatue
HAVE_SECURE_GETENV.
* sysdeps/unix/sysv/linux/libc_fatal.c (__libc_message): Rename
__secure_getenv to secure_getenv. Update copyright years.
* hesiod/hesiod.c (hesiod_init): Use __libc_secure_getenv.
All these internal references should be using an internal name
such as __libc_secure_getenv. It's not kosher for these things
to refer to a nonstandard name that doesn't start with __.