Build error on pid_t call

[Marco Atzeri]

latest dev source, it seems there is a mismatch in declarations


make[3]: Entering directory 
'/cygdrive/e/cyg_pub/hg/octave_build64/libinterp'
  CXX      corefcn/corefcn_libcorefcn_la-help.lo
In file included from 
/usr/lib/gcc/x86_64-pc-cygwin/5.4.0/include/c++/cstdlib:72:0,
from /pub/hg/octave/libinterp/corefcn/help.cc:27:
../libgnu/sys/wait.h:419:1:
error: invalid conversion from
‘pid_t (*)(pid_t, __wait_status_ptr_t, int) {aka int (*)(int, void*, 
int)}’ to
‘pid_t (*)(pid_t, int*, int) {aka int (*)(int, int*, int)}’ [-fpermissive]
 _GL_CXXALIAS_SYS (waitpid, pid_t, (pid_t pid, int *statusp, int options));
 ^
make[3]: *** [Makefile:5569: corefcn/corefcn_libcorefcn_la-help.lo] Error 1

Regards
Marco