clang-format: update c/cc coding style

Update all cc code using .clang-format; please do so as well for future PRs
etc.; emacs has a handy 'clang-format' mode to make this automatic.

For comparing old changes with git blame, we can disregard this one using
--ignore-rev

(see https://www.moxio.com/blog/43/ignoring-bulk-change-commits-with-git-blame )

lib/tokenize.cc

@@ -23,14 +23,14 @@
 #include "mu-tokenizer.hh"
 
 int
-main (int argc, char *argv[])
+main(int argc, char* argv[])
 {
 	std::string s;
 
 	for (auto i = 1; i < argc; ++i)
 		s += " " + std::string(argv[i]);
 
-	const auto tvec = Mu::tokenize (s);
+	const auto tvec = Mu::tokenize(s);
 	for (const auto& t : tvec)
 		std::cout << t << std::endl;