Build break - port amd64 - libmandoc/roff.o

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

#   compile  libmandoc/roff.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 -Werror     
--sysroot=/test-bed/dst -DVERSION=\"1.12.0\" -DUGLY -DHAVE_STRLCAT 
-DHAVE_STRLCPY  -c    /test-bed/src/external/bsd/mdocml/lib/libmandoc/../../dist/roff.c 
-o roff.o
cc1: warnings being treated as errors
/test-bed/src/external/bsd/mdocml/lib/libmandoc/../../dist/roff.c: In function 
'roff_parsetext':
/test-bed/src/external/bsd/mdocml/lib/libmandoc/../../dist/roff.c:576:5: error: 
new qualifiers in middle of multi-level non-const cast are unsafe

*** Failed target:  roff.o
*** Failed command: /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 
-Werror --sysroot=/test-bed/dst -DVERSION=\"1.12.0\" -DUGLY -DHAVE_STRLCAT 
-DHAVE_STRLCPY -c /test-bed/src/external/bsd/mdocml/lib/libmandoc/../../dist/roff.c -o 
roff.o
*** Error code 1

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