Make check-names.sh find the right names in 3rdparty

Essentially adds the Everest .h and .c files to the various variables. This
should be generalized at some point, but there is no infrastructure for this
yet.
diff --git a/tests/scripts/list-enum-consts.pl b/tests/scripts/list-enum-consts.pl
index a304217..e59517b 100755
--- a/tests/scripts/list-enum-consts.pl
+++ b/tests/scripts/list-enum-consts.pl
@@ -9,6 +9,9 @@
 -d 'include/mbedtls' or die "$0: must be run from root\n";
 
 @ARGV = grep { ! /compat-1\.3\.h/ } <include/mbedtls/*.h>;
+push @ARGV, "3rdparty/everest/include/everest/everest.h";
+push @ARGV, "3rdparty/everest/include/everest/x25519.h";
+
 
 my @consts;
 my $state = 'out';