This patch was adapted from a 2.6 patch which came from upstream:
http://bugs.python.org/issue19561

--- Python-2.7.9/Include/pyport.h.orig	2014-12-10 07:59:32.000000000 -0800
+++ Python-2.7.9/Include/pyport.h	2015-04-08 18:38:02.450233799 -0700
@@ -640,11 +640,6 @@
 in platform-specific #ifdefs.
 **************************************************************************/
 
-#ifdef SOLARIS
-/* Unchecked */
-extern int gethostname(char *, int);
-#endif
-
 #ifdef __BEOS__
 /* Unchecked */
 /* It's in the libs, but not the headers... - [cjh] */