[3.11] gh-95957: Add instructions for Tcl/Tk and OpenSSL on RHEL/CentOS 7 (GH-95964)

[miss-islington]

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Co-authored-by: Erlend E. Aasland [email protected] (cherry picked from commit ab4d72954f3c3fe4bdf51dc6a9cf0ed38f210a68)

Co-authored-by: Christian Heimes [email protected]

• Issue: gh-95957

[miss-islington]

Status check is done, and it's a success ✅ .

[tiran]

@pablogsal RM, please take a look

[miss-islington]

Status check is done, and it's a success ✅ .

[pablogsal]

Will check today after work 👍

[miss-islington]

Status check is done, and it's a success ✅ .