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/Makefile.tool.am b/Makefile.tool.am
index fbc43fd..c35ffc7 100644
--- a/Makefile.tool.am
+++ b/Makefile.tool.am
@@ -1,5 +1,5 @@
 
-SUBDIRS = . tests docs
+SUBDIRS = . tests
 
 include $(top_srcdir)/Makefile.all.am