CERT MEM04-C suggests that zero length allocations behaviour might be
surprising so it should be avoided. This adds a check to ensure a zero
length allocation will be avoided. Additionally it returns errors to
the caller rather than warning directly (in some error paths)
NetSurf includes are now done with ""s and other system includes with <>s as C intended.
The scandeps tool has been updated to only look for ""ed includes, and to verify that the
files exist in the tree before adding them to the dependency lines. The depend rule has
therefore been augmented to make sure the autogenerated files are built before it is run.
This is untested under self-hosted RISC OS builds. All else tested and works.
svn path=/trunk/netsurf/; revision=3307
