build failures: string.h vs. HP-UX

[Jim Meyering]

Check out the red columns here:

  http://proulx.com:9000/

Maybe a system-provided mempcpy macro is causing trouble?
---------------------------

...
source='mempcpy.c' object='mempcpy.o' libtool=no \
        DEPDIR=.deps depmode=hp /bin/sh ../build-aux/depcomp \
        cc  -I.      -Ae -O -c mempcpy.c
cc: "string.h", line 39: error 1000: Unexpected symbol: "__dest".
cc: "string.h", line 39: error 1000: Unexpected symbol: "__src".
cc: "string.h", line 39: error 1573: Type of "__src" is undefined due to an 
illegal declaration.
cc: "string.h", line 49: error 1000: Unexpected symbol: "__dst".
cc: "string.h", line 49: error 1000: Unexpected symbol: "__src".
cc: "string.h", line 49: error 1573: Type of "__dst" is undefined due to an 
illegal declaration.
cc: "mempcpy.c", line 24: error 1711: Inconsistent parameter list declaration 
for "mempcpy".
make[2]: *** [mempcpy.o] Error 1
make[2]: Leaving directory 
`/usr/local/build/coreutils/hppa-hpux11.11-hpcc-coreutils/build/lib'
make[1]: *** [all] Error 2
make[1]: Leaving directory 
`/usr/local/build/coreutils/hppa-hpux11.11-hpcc-coreutils/build/lib'
make: *** [all-recursive] Error 1
program finished with exit code 2