graph-depends: ignore the 'target-purgelocales' target

Otherwise, graph-depends tries to call 'make target-purgelocales-show-depends',
which does not exist, as 'target-purgelocales' is not an actual package.

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

support/scripts/graph-depends

@@ -170,6 +170,7 @@ TARGET_EXCEPTIONS = [
     "target-generic-hostname",
     "target-root-passwd",
     "target-post-image",
+    "target-purgelocales",
 ]
 
 # In full mode, start with the result of get_targets() to get the main