Remove empty newlines in #include blocks.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

src/common/x64/cpu_detect.cpp

@@ -2,14 +2,12 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include "cpu_detect.h"
 #include <cstring>
 #include <string>
 #include <thread>
-
 #include "common/common_types.h"
 
-#include "cpu_detect.h"
-
 namespace Common {
 
 #ifndef _MSC_VER