More docs build tweaks:

- Actually remove the dead docs/images/massif*.png files (this was meant to
  happen in r10720).

- Inline $TOOL/docs/Makefile.am into $TOOL/Makefile.am for all 10 tools.  10
  fewer Makefile.am files FTW!


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10721 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/cachegrind/Makefile.am b/cachegrind/Makefile.am
index 04c798e..fa257f0 100644
--- a/cachegrind/Makefile.am
+++ b/cachegrind/Makefile.am
@@ -1,5 +1,7 @@
 include $(top_srcdir)/Makefile.tool.am
 
+EXTRA_DIST = docs/cg-manual.xml
+
 #----------------------------------------------------------------------------
 # Headers, etc
 #----------------------------------------------------------------------------