Compiler Attributes: Add __overloadable for Clang

In order for FORTIFY_SOURCE to use __pass_object_size on an "extern
inline" function, as all the fortified string functions are, the functions
must be marked as being overloadable (i.e. different prototypes due
to the implicitly injected object size arguments). This allows the
__pass_object_size versions to take precedence.

Cc: Nathan Chancellor <[email protected]>
Cc: [email protected]
Reviewed-by: Miguel Ojeda <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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