Trivial changes: whitespace and modes.

Remote whitespace at the ends of lines.
Remove blank lines from the ends of files.
Change modes on source files so that they
are not executable.

Signed-off-by: Dan Cross <cross@gajendra.net>

src/libthread/BSD.c

@@ -288,7 +288,7 @@ threadexitsall(char *msg)
 	if(msg == nil)
 		msg = "";
 
-	/* 
+	/*
 	 * Only one guy, ever, gets to run this.
 	 * If two guys do it, inevitably they end up
 	 * tripping over each other in the underlying
@@ -401,4 +401,3 @@ _threadpexit(void)
 {
 	_exit(0);
 }
-