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

lib/version.c

@@ -40,6 +40,10 @@
 #include <stringprep.h>
 #endif
 
+#ifdef USE_LIBPSL
+#include <libpsl.h>
+#endif
+
 #if defined(HAVE_ICONV) && defined(CURL_DOES_CONVERSIONS)
 #include <iconv.h>
 #endif
@@ -100,6 +104,11 @@ char *curl_version(void)
     ptr += len;
   }
 #endif
+#ifdef USE_LIBPSL
+  len = snprintf(ptr, left, " libpsl/%s", psl_get_version());
+  left -= len;
+  ptr += len;
+#endif
 #ifdef USE_WIN32_IDN
   len = snprintf(ptr, left, " WinIDN");
   left -= len;