Update to GCC 15#2372

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mark9064 wants to merge 2 commits intoInfiniTimeOrg:mainfrom

mark9064:update-to-gcc14

Commits on Jan 10, 2026

Update GCC (in doc and docker) to GCC15 (Arm GNU Toolchain Version 15.2.Rel1 Released: December 17, 2025, https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads)
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Implement required stubs instead of linking nosys
mark9064
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