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/test/thello.c

@@ -7,4 +7,3 @@ threadmain(int argc, char **argv)
 {
 	print("hello, world\n");
 }
-