[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)

This is a part of #97655.

Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593)

Reverts llvm/llvm-project#98075

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[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)

This is a part of #97655.

[libc] fix baremetal getchar (#98515)

baremetal getchar got the wrong find/replace in the initial patch. This
patch fixes it.

Reland: [libc] Move off_t and stdio macros to proxy hdrs (#98384)

reland of https://github.com/llvm/llvm-project/pull/98215

Additionally adds proxy headers for FILE and the fopencookie types

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Reland: [libc] Move off_t and stdio macros to proxy hdrs (#98384)

reland of https://github.com/llvm/llvm-project/pull/98215

Additionally adds proxy headers for FILE and the fopencookie types

The arm32 build has been failing due to redefinitions of the off_t type.
This patch fixes this by moving off_t to a proper proxy header. To do
this, it also moves stdio macros to a proxy header to hopefully avoid
including this proxy header alongside this public stdio.h.

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[libc] Include stdio.h in baremetal getchar.cpp (#98188)

This is needed for the EOF constant.

[libc] Remove unnecessary `stdio.h` includes (#98132)

[libc] Provide baremetal implementation of getchar (#98059)

This introduces opaque type `struct __llvm_libc_stdin` and a symbol
`__llvm_libc_stdin_read` that's intended to be provided by the vendor

[libc] Provide baremetal implementation of getchar (#98059)

This introduces opaque type `struct __llvm_libc_stdin` and a symbol
`__llvm_libc_stdin_read` that's intended to be provided by the vendor.

`__llvm_libc_stdin_read` intentionally has the same signature as
`cookie_read_function_t` so it can be used with `fopencookie` to
represent `stdin` as `FILE *` in the future.

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