*new* strip_whitespace.pl: removes all the whitespace from a source file
Smatch has whitespace_only.sh which checks kernel patches to make sure
that only whitespace changed. It worked by compiling the module twice
which was slow. Also it potentially missed changes in #ifdefed out code.
The new strip_whitespace.pl script is instant. Also it's easier to read
the output to see what changed.
I've modified whitespace_only.sh to use strip_whitespace.pl unless you pass
--compile to it. In that case it compiles the code and also uses
strip_whitespace.pl.
Signed-off-by: Dan Carpenter <error27@gmail.com>