Build world failed if NO_SHARED is defined in make.conf

[Neo_Chen]

Build Failed if NO_SHARED is defined in make.conf
Branch: releng/11.2
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/usr/obj/usr/vcs/src/tmp/usr/bin/ld: error: duplicate symbol: vwarn
 >>> defined at utils.c:65 
(/usr/vcs/src/cddl/contrib/opensolaris/tools/ctf/common/utils.c:65)
 >>>    utils.o:(vwarn)
 >>> defined at err.c:148 (/usr/vcs/src/lib/libc/gen/err.c:148)
 >>>    err.o:(.text+0x4F0) in archive 
/usr/obj/usr/vcs/src/tmp/usr/lib/libc.a
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