Build broken from latest ntp import

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

With sources current as of 2013-12-28 at 09:20:00 UTC ...

#   compile  ntp-keygen/ntp-keygen-opts.o
/test-bed/tools/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   -Wno-format-zero-length  -Werror 
-Wno-missing-noreturn    --sysroot=/test-bed/dst -DHAVE_CONFIG_H 
-I/test-bed/src/external/bsd/ntp/include  
-I/test-bed/src/external/bsd/ntp/dist/include  
-I/test-bed/src/external/bsd/ntp/dist/lib/isc/include  
-I/test-bed/src/external/bsd/ntp/dist/lib/isc/unix/include  
-I/test-bed/src/external/bsd/ntp/dist/lib/isc/nothreads/include 
-DHAVE_DNSREGISTRATION=1 -DOPENSSL -DWANT_IPV6 
-I/test-bed/src/external/bsd/ntp/dist/include 
-I/test-bed/src/external/bsd/ntp/dist/sntp/libopts  -c    
/test-bed/src/external/bsd/ntp/dist/util/ntp-keygen-opts.c
cc1: warnings being treated as errors
/test-bed/src/external/bsd/ntp/dist/util/ntp-keygen-opts.c: In function 
'doOptImbits':
/test-bed/src/external/bsd/ntp/dist/util/ntp-keygen-opts.c:1079:5: error: cast 
discards qualifiers from pointer target type
/test-bed/src/external/bsd/ntp/dist/util/ntp-keygen-opts.c: In function 
'doOptModulus':
/test-bed/src/external/bsd/ntp/dist/util/ntp-keygen-opts.c:1141:5: error: cast 
discards qualifiers from pointer target type

*** Failed target:  ntp-keygen-opts.o

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