A small patch for building on Solaris and Illumos

Hello, I would like to submit a small patch to enable clean building of 2.2.4 on Solaris 11 and Illumos. Only two small changes are required: src/include/sysutmp.h: Line 17: -#if !defined(sun) && !defined(sgi) && !defined(hpux) +#if !defined(__sun) && !defined(sgi) && !defined(hpux) src/include/libradius.h After line 74: +#if defined(__sun) + typedef void(*sig_t)(int); +#endif + -- Ian.