Redundant declarations for `environ`

The unconditional declaration of environ in RtsSymbols.c is resulting in build failures when -Werror=redundant-decls is enabled and libc already provides a declaration in <unistd.h>. We should guard the declaration in RtsSymbols.c with a configure check.

marked this issue as related to #20577 (closed)

marked this issue as related to #20512 (closed)

added needs triage label

added Pnormal RTS Tbug ghc build failure labels and removed needs triage label

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mentioned in merge request !7244 (closed)

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assigned to @bgamari

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closed with commit 247cd336

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mentioned in issue #23759 (closed)