cookies: Add support for Mozilla's Publix Suffix List

Use libpsl to check the domain value of Set-Cookie headers (and cookie
jar entries) for not being a Publix Suffix.

The configure script checks for "libpsl" by default. Disable the check
with --without-libpsl.

Ref: https://publicsuffix.org/
Ref: https://github.com/publicsuffix/list
Ref: https://github.com/rockdaboot/libpsl

src/tool_help.c

@@ -316,6 +316,9 @@ void tool_version_info(void)
     }
 #ifdef USE_METALINK
     printf("Metalink ");
+#endif
+#ifdef USE_LIBPSL
+    printf("PSL ");
 #endif
     puts(""); /* newline */
   }