Fix comment about sshpam_const and AIX.
From mschwager via github.
diff --git a/auth-pam.c b/auth-pam.c
index 7cf9cf5..f80278c 100644
--- a/auth-pam.c
+++ b/auth-pam.c
@@ -68,9 +68,9 @@
/* OpenGroup RFC86.0 and XSSO specify no "const" on arguments */
#ifdef PAM_SUN_CODEBASE
-# define sshpam_const /* Solaris, HP-UX, AIX */
+# define sshpam_const /* Solaris, HP-UX, SunOS */
#else
-# define sshpam_const const /* LinuxPAM, OpenPAM */
+# define sshpam_const const /* LinuxPAM, OpenPAM, AIX */
#endif
/* Ambiguity in spec: is it an array of pointers or a pointer to an array? */