rts: replace ad-hoc MYTASK_USE_TLV with proper CC_SUPPORTS_TLS

Cheng Shaorequested to merge
wip/rts-tls-proper into master

This patch replaces the ad-hoc MYTASK_USE_TLV with the CC_SUPPORTS_TLS macro. If TLS support is detected by autoconf, then we should use that for managing myTask in the threaded RTS.

Related: #24947 (closed)

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