Update .gitignore once more for fuzz test

.gitignore

@@ -1,3 +1,5 @@
+*.o
+*.a
 /doc/doxygen/output/html
 /src/apps/snmp/LwipMibCompiler/CCodeGeneration/bin/
 /src/apps/snmp/LwipMibCompiler/CCodeGeneration/obj/
@@ -12,4 +14,5 @@
 /src/apps/snmp/LwipMibCompiler/LwipMibCompiler.userprefs
 /src/apps/snmp/LwipMibCompiler/*.suo
 /test/fuzz/output
-/test/lwip_fuzz
+/test/fuzz/lwip_fuzz
+/test/fuzz/.depend