Building strtoull on HP-UX 10.20 requires stdint which is not included

[Albert Chin]

With latest gnulib on HP-UX 10.20:
  $ ./gnulib-tool --create-testdir --dir=t strtoull
  $ cd t
  $ ./configure
  ...
  $ gmake
  ...
  source='dummy.c' object='dummy.o' libtool=no \
  DEPDIR=.deps depmode=hp /bin/sh ../build-aux/depcomp \
  cc -Ae -DHAVE_CONFIG_H -I. -I..     -g -c dummy.c
  source='strtoull.c' object='strtoull.o' libtool=no \
  DEPDIR=.deps depmode=hp /bin/sh ../build-aux/depcomp \
  cc -Ae -DHAVE_CONFIG_H -I. -I..     -g -c strtoull.c
  cpp: "stdlib.h", line 52: error 4036: Can't open include file 'stdint.h'.
  gmake[4]: *** [strtoull.o] Error 1

-- 
albert chin (address@hidden)