Build break - port amd64 - libntp

[Paul Goyette <paul%whooppee.com@localhost>]

From sources updated minutes ago ...

#   compile  libntp/decodenetnum.o
/build/netbsd-local/tools/x86_64/amd64/bin/x86_64--netbsd-gcc -O2 -std=gnu99  
-Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith 
-Wno-sign-compare  -Wno-traditional  -Wa,--fatal-warnings -Wreturn-type 
-Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter 
-Wno-sign-compare -Wsign-compare -Wformat=2 -Werror -Wno-missing-noreturn   
-fstack-protector -Wstack-protector   --param ssp-buffer-size=1   
--sysroot=/build/netbsd-local/dest/amd64 -DHAVE_CONFIG_H 
-I/build/netbsd-local/src/external/bsd/ntp/include  
-I/build/netbsd-local/src/external/bsd/ntp/dist/include  
-I/build/netbsd-local/src/external/bsd/ntp/dist/lib/isc/include  
-I/build/netbsd-local/src/external/bsd/ntp/dist/lib/isc/unix/include  
-I/build/netbsd-local/src/external/bsd/ntp/dist/lib/isc/nothreads/include 
-DOPENSSL -DWANT_IPV6  -D_FORTIFY_SOURCE=2 -c    
/build/netbsd-local/src/external/bsd/ntp/dist/libntp/decodenetnum.c -o 
decodenetnum.o
cc1: warnings being treated as errors
/build/netbsd-local/src/external/bsd/ntp/dist/libntp/decodenetnum.c: In 
function 'decodenetnum':
/build/netbsd-local/src/external/bsd/ntp/dist/libntp/decodenetnum.c:73:2: 
error: implicit declaration of function 'ZERO'
*** [decodenetnum.o] Error code 1
nbmake: stopped in /build/netbsd-local/src/external/bsd/ntp/lib/libntp

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