rts: Only declare environ when necessary
Previously we would unconditionally provide a declaration for environ
,
even if <unistd.h>
already provided one. This would result in
-Werror
builds failing on some platforms.
Fixes #20861 (closed).
Previously we would unconditionally provide a declaration for environ
,
even if <unistd.h>
already provided one. This would result in
-Werror
builds failing on some platforms.
Fixes #20861 (closed).