Zap warning against __findenv usage, it is not exported by libc

The comment probably made sense before guenther restricted the symbols
exported by libc in 2015.

environ and __progname are not declared in a public header; declare them
in libc's hidden/stdlib.h instead of in each .c file that needs one

ok deraadt@ gsoares@ mpi@

Wrap <stdlib.h> so that calls go direct and the symbols not in the
C standard are all weak.
Apply __{BEGIN,END}_HIDDEN_DECLS to gdtoa{,imp}.h, hiding the
arch-specific __strtorx, __ULtox_D2A, __strto

Wrap <stdlib.h> so that calls go direct and the symbols not in the
C standard are all weak.
Apply __{BEGIN,END}_HIDDEN_DECLS to gdtoa{,imp}.h, hiding the
arch-specific __strtorx, __ULtox_D2A, __strtorQ, __ULtoQ_D2A symbols.

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Check for duplicate variables in the environment when setting a value
via setenv() or putenv(). OK miod@

Make putenv(), setenv() and unsetenv() standards compliant. The
standard explicitly disallows passing setenv a name with a '=' in
it but historic BSD behavior is to allow this but to ignore the '='

Make putenv(), setenv() and unsetenv() standards compliant. The
standard explicitly disallows passing setenv a name with a '=' in
it but historic BSD behavior is to allow this but to ignore the '='
and anything after it.

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zap remaining rcsid.

Kill old files that are no longer compiled.

okay theo

ansi + de-register

ok otto deraadt

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

use proper __findenv() prototype; millert@ ok

change to lite2 getenv(); getenv(NULL) now returns NULL

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

Add prototypes for internal functions
Change inline to __inline

initial import of NetBSD tree