Fix multi-byte comment handle. If \n is contained in trailing-byte, it shouldn't be handled as multi-byte.

This is illegal case I know. When missed to specify `-jcode` option, for example run ctags without any options on windows(i.e.: this works as -jcode=sjis), and code is utf-8 encoded,
ctags skip the bytes though it's NEWLINE. Below is a way to reproduce.

```java
package ctags.example;

public class Foo {
	public void doIt() {
		try {
			// あ
			if (true) {
			}
		} catch (Throwable e) {
		}
	}
}
```

NOTE, This won't reproduce except windows.
`Foo.java` is utf-8 encoded. Then `あ` takes 3bytes. Run just `ctags.exe` not specified any arguments.

```
!_TAG_FILE_ENCODING	cp932	//
!_TAG_FILE_FORMAT	2	/extended format; --format=1 will not append ;" to lines/
!_TAG_FILE_SORTED	1	/0=unsorted, 1=sorted, 2=foldcase/
!_TAG_PROGRAM_AUTHOR	Darren Hiebert	/dhiebert@users.sourceforge.net/
!_TAG_PROGRAM_JP_AUTHOR	HIGASHI Hirohito	/Twitter: @h_east/
!_TAG_PROGRAM_JP_URL	http://hp.vector.co.jp/authors/VA025040/	//
!_TAG_PROGRAM_NAME	Exuberant Ctags	//
!_TAG_PROGRAM_URL	http://ctags.sourceforge.net	/official site/
!_TAG_PROGRAM_VERSION	5.8J2	//
Foo	.\UserResource.java	/^public class Foo {$/;"	c
catch	.\UserResource.java	/^		} catch (Throwable e) {$/;"	m	class:Foo
ctags.example	.\UserResource.java	/^package ctags.example;$/;"	p
doIt	.\UserResource.java	/^	public void doIt() {$/;"	m	class:Foo
```

`catch` is not a method, but it entered on tags file.