Add __gdtoa to the list of FreeBSD private symbols.  Unfortunately, this is used by some 3rd party applications when {e,f,g}cvt() are not found.  POSIX defines the xcvt() funtions but says they are deprecated in favor or sprintf().  We'll import these functions from OpenBSD and remove __gdtoa() from the exported interfaces when libc version is bumped.
Add __gdtoa to the list of FreeBSD private symbols.  Unfortunately,
this is used by some 3rd party applications when {e,f,g}cvt() are
not found.  POSIX defines the xcvt() funtions but says they are
deprecated in favor or sprintf().  We'll import these functions
from OpenBSD and remove __gdtoa() from the exported interfaces
when libc version is bumped.

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