With the recent VG_(message) change,

With the recent VG_(message) change,
VALGRIND_{PRINTF,PRINTF_BACKTRACE,INTERNAL_PRINTF} were no longer appending
newlines.  This meant that --trace-malloc=yes spewed everything onto a
single line, among other things.

Rather than adding the newline back in, I chose to offically change their
behaviour to not add the newlines, as this is more flexible (and the reason
for the underlying VG_(message) change).  I updated all the relevant places
I could find.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10694