Including gsl_rstat.h causes "unknown type name size_t" error

[Arun Isaac]

Including gsl/gsl_rstat.h does not compile due to an "unknown type name
size_t" error.

Source code below.

--8<---------------cut here---------------start------------->8---
#include <gsl/gsl_rstat.h>

int main ()
{
  return 0;
}
--8<---------------cut here---------------end--------------->8---

Error message below.

--8<---------------cut here---------------start------------->8---
In file included from foo.c:1:
/gnu/store/br8zjl7r2r960syn8wyswdpbh4skvx0v-profile/include/gsl/gsl_rstat.h:42:3:
 error: unknown type name ‘size_t’
   42 |   size_t n;        /* number of data added */
      |   ^~~~~~
/gnu/store/br8zjl7r2r960syn8wyswdpbh4skvx0v-profile/include/gsl/gsl_rstat.h:59:3:
 error: unknown type name ‘size_t’
   59 |   size_t n;        /* number of data points added */
      |   ^~~~~~
/gnu/store/br8zjl7r2r960syn8wyswdpbh4skvx0v-profile/include/gsl/gsl_rstat.h:65:1:
 error: unknown type name ‘size_t’
   65 | size_t gsl_rstat_n(const gsl_rstat_workspace *w);
      | ^~~~~~
/gnu/store/br8zjl7r2r960syn8wyswdpbh4skvx0v-profile/include/gsl/gsl_rstat.h:1:1:
 note: ‘size_t’ is defined in header ‘<stddef.h>’; did you forget to ‘#include 
<stddef.h>’?
  +++ |+#include <stddef.h>
    1 | /* rstat/gsl_rstat.h
--8<---------------cut here---------------end--------------->8---

Including stdio.h or stddef.h fixes this issue, but that should not be
required. Hence, this is a bug.

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Thanks!

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