sim: testsuite: update ignored .exp files [PR sim/29596]

Now that we run `check/foo.exp` instead of `check/./foo.exp`,
update the config/ & lib/ exceptions to cover both paths.

Bug: https://sourceware.org/PR29596

sim/Makefile.in

@@ -2464,7 +2464,9 @@ site-sim-config.exp: Makefile
 
 # Ignore dirs that only contain configuration settings.
 check/./config/%.exp: ; @true
+check/config/%.exp: ; @true
 check/./lib/%.exp: ; @true
+check/lib/%.exp: ; @true
 
 check/%.exp:
 	$(AM_V_at)mkdir -p testsuite/$*

sim/testsuite/local.mk

@@ -40,7 +40,9 @@ DO_RUNTEST = \
 
 # Ignore dirs that only contain configuration settings.
 check/./config/%.exp: ; @true
+check/config/%.exp: ; @true
 check/./lib/%.exp: ; @true
+check/lib/%.exp: ; @true
 
 check/%.exp:
 	$(AM_V_at)mkdir -p testsuite/$*