ctf: Remove unused function prototype for getpname()

This function prototype should have been removed along with the
implementation.

Fixes: 3dd552426409 ctfdump: Use getprogname()
MFC after: 1 day

ctfdump: Remove definitions of warn() and vwarn()

The presence of the latter causes a link error when building a
statically linked ctfdump(1) because libc defines the same symbol.
libc's warn() is d

ctfdump: Remove definitions of warn() and vwarn()

The presence of the latter causes a link error when building a
statically linked ctfdump(1) because libc defines the same symbol.
libc's warn() is defined as a weak symbol and so does not cause the same
problem, but let's just use libc's version.

Reported by: stephane rochoy <stephane.rochoy@stormshield.eu>
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

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