Handle missing SIZE_MAX

Change-Id: Id931f5339e19ce5ff635af93fe9f60f3abebe069

sal/osl/unx/security.cxx

@@ -40,6 +40,9 @@
 #define getpwuid_r(uid, pwd, buf, buflen, result) (*(result) = getpwuid(uid), (*(result) ? (memcpy (buf, *(result), sizeof (struct passwd)), 0) : errno))
 #endif
 
+#ifndef SIZE_MAX
+#define SIZE_MAX ((size_t)-1)
+#endif
 
 static oslSecurityError SAL_CALL
 osl_psz_loginUser(const sal_Char* pszUserName, const sal_Char* pszPasswd,