Openat and localcharset issues on Darwin

[Sergey Poznyakoff]

Hello,

The following gnulib-related message was obtained while compiling GNU
tar on powerpc-apple-darwin8.6.0 with GCC 4.1.1 and native ld:

openat.c: In function 'rpl_openat':
openat.c:60: warning: 'mode_t' is promoted to 'int' when passed through '...'
openat.c:60: warning: (so you should pass 'int' not 'mode_t' to 'va_arg')
openat.c:60: note: if this code is reached, the program will abort

/usr/bin/ld: warning multiple definitions of symbol _locale_charset
../lib/libtar.a(localcharset.o) definition of _locale_charset in section 
(__TEXT,__text)
/usr/lib/libiconv.dylib(localcharset.o) definition of _locale_charset

Regards,
Sergey