include limits.h

[ffontaine]

Include limits.h to avoid the following build failure:

poundctl.c: In function 'oi_getn':
poundctl.c:232:29: error: 'INT_MAX' undeclared (first use in this function)
  232 |   if (errno || n < 0 || n > INT_MAX)
      |                             ^~~~~~~

Fixes:

• http://autobuild.buildroot.org/results/4edfffcd5d4383c57947d97139331e0bf2cb6155

[graygnuorg]

Thanks, Fabrice. However, since such constants are used in multiple files, I believe it is best to include limits.h in the pound.h file, which I did in commit 05d4991.

[ffontaine]

Sure closing this PR