DEPS handling: Use DEPS_RM everywhere

DEPS_RM is currently the same as DEPS, so no functional change.

This patch is the result of two perl runes:

  git-grep -l 'rm.*DEPS' | xargs perl -i~ -pe 'next unless m/^\t+rm\b/; s/\bDEPS\b/DEPS_RM/;'

  git-grep -l 'RM.*DEPS' | xargs perl -i~ -pe 'next unless m/^\t+\$\(RM\)/; s/\bDEPS\b/DEPS_RM/;'

And editing  tools/xenstat/libxenstat/Makefile  by hand.

I verified that I didn't miss anything with this rune:

  git-grep '\bDEPS\b' | grep -v include |less

Reported-by: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

tools/python/Makefile

@@ -39,7 +39,7 @@ test:
 clean:
 	find . \( -name "*.py[ocd]" -o -name "*~" -o -name "_*.[hc]" \) -delete
 	rm -rf build/
-	rm -f $(DEPS)
+	rm -f $(DEPS_RM)
 
 .PHONY: distclean
 distclean: clean