Replace stddef.h with the one from musl.#61

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ComputerNerd wants to merge 3 commits intoJonimoose:masterfrom

ComputerNerd:stddef_musl

Commits on Apr 26, 2021

Add the stdint.h headers from musl.
ComputerNerd
committed

Commits on Apr 30, 2021

Merge remote-tracking branch 'upstream/master' into stdint
ComputerNerd
committed
Replace the stddef.h header with the one from musl to resolve an error where ptrdiff_t was missing.
ComputerNerd
committed