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/check-names.sh b/tests/scripts/check-names.sh
index 7d2302c..b07db23 100755
--- a/tests/scripts/check-names.sh
+++ b/tests/scripts/check-names.sh
@@ -82,10 +82,12 @@
 printf "Likely typos: "
 sort -u actual-macros enum-consts > _caps
 HEADERS=$( ls include/mbedtls/*.h include/psa/*.h | egrep -v 'compat-1\.3\.h' )
+HEADERS="$HEADERS 3rdparty/everest/include/everest/everest.h 3rdparty/everest/include/everest/x25519.h"
+LIBRARY="$( ls library/*.c ) 3rdparty/everest/library/everest.c 3rdparty/everest/library/x25519.c"
 NL='
 '
 sed -n 's/MBED..._[A-Z0-9_]*/\'"$NL"'&\'"$NL"/gp \
-    $HEADERS library/*.c \
+    $HEADERS $LIBRARY \
     | grep MBEDTLS | sort -u > _MBEDTLS_XXX
 TYPOS=$( diff _caps _MBEDTLS_XXX | sed -n 's/^> //p' \
             | egrep -v 'XXX|__|_$|^MBEDTLS_.*CONFIG_FILE$' || true )