Build failure on amd64 in libmagic/softmagic.so

[Scott Ellis <scotte%warped.com@localhost>]

I'm getting this on amd64 using -current as of a few minutes ago.  I 
guess it's just fallout from the recent import of file?

--- softmagic.so ---
#   compile  libmagic/softmagic.so
/data/scotte/netbsd_build/amd64/tooldir/bin/x86_64--netbsd-gcc -O2 -pipe 
-Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith 
-Wno-sign-compare -Wno-traditional -Wa,--fatal-warnings -Wreturn-type 
-Wswitch -Wshadow  -Werror -march=nocona -fstack-protector 
-Wstack-protector --param ssp-buffer-size=1   -DMAGIC='
"/usr/share/misc/magic"' -DHAVE_CONFIG_H -DQUICK -DBUILTIN_ELF 
-DELFCORE -I/nbu/source/netbsd/src/lib/libmagic 
-I/nbu/source/netbsd/src/dist/file/src  -D_FORTIFY_SOURCE=2  -nostdinc 
-isystem /data/scotte/netbsd_build/amd64/destdir/usr/include -c    -fPIC 
-DPIC /nbu/source/netbsd/src/dist/file/src/softmagic.c -o softma
gic.so
cc1: warnings being treated as errors
/nbu/source/netbsd/src/dist/file/src/softmagic.c: In function 'mcopy':
/nbu/source/netbsd/src/dist/file/src/softmagic.c:854: warning: format 
'%zu' expects type 'size_t', but argument 3 has type '__uint32_t'
*** [softmagic.so] Error code 1