Clang-tidy warnings.

bufferTest.cc

@@ -4,8 +4,10 @@
 
 
 int
-main()
+main(int argc, char *argv[])
 {
+	(void)argc; (void)argv;
+
 	klib::Buffer	buffer("hlo, world");
 
 	std::cout << buffer.Contents() << std::endl;

dictionaryTest.cc

@@ -35,6 +35,8 @@ testSetKV(Dictionary &pb, const char *k, uint8_t kl, const char *v,
 int
 main(int argc, const char *argv[])
 {
+	(void)argc; (void)argv;
+
 	Arena		arena;
 	TLV::Record	value;
 	TLV::Record	expect;

tlvTest.cc

@@ -77,6 +77,8 @@ runSuite(Arena &backend, const char *label)
 int
 main(int argc, const char *argv[])
 {
+	(void)argc; (void)argv;
+
 	Arena	arenaStatic;
 	Arena	arenaMem;