libio: Add hidden prototype for ungetc
And make ungetc the primary symbol, with _IO_ungetc as an alias.
Reviewed-by:
Adhemerval Zanella <adhemerval.zanella@linaro.org>
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And make ungetc the primary symbol, with _IO_ungetc as an alias.
Reviewed-by:
Adhemerval Zanella <adhemerval.zanella@linaro.org>