pidgin/ljfisher-ssl-client-auth

Complete the conversion of win32 utsname construction to bounds-checked access.

This patch changes strcat to g_strlcat with appropriate bounds.
VOID:POINTER,POINTER,OBJECT
BOOLEAN:OBJECT,POINTER,STRING
VOID:STRING,STRING
VOID:STRING,STRING,DOUBLE
VOID:ENUM,STRING,STRING
VOID:ENUM,STRING,STRING,BOOLEAN
VOID:FLAGS,FLAGS
VOID:STRING,STRING,OBJECT,OBJECT