The README can turn awkward after running the rename script.

This fix moves the man page destination to the src directory, where all
its dependencies (including transitive dependencies) live. A phony `vcc`
target was also added to make the dependency graph cleaner. Since the
`vmodtool` generates 4 files from a single vcc file, an abstract target
makes things a lot easier.

Regarding `rst2man`, since the `make` build fails if you don't have it,
there's no point in treating it as a warning in `autoconf`. It's only
more complexity and confusion.

Inherit the prefix from Varnish and document installation directories

It is modified by the sed(1) command and git-rm(1) can complain about that
depending on your local configuration:

   error: the following file has local modifications:
       rename-vmod-script
   (use --cached to keep the file, or -f to force removal)

Adding a note for a common problem

better error handling, fixes for parallel make, remove generated files from dist

On getting dependencies right:

See automake doc 9.4.1 Built Sources Example / Recording Dependencies manually

Conflicts:
	configure.ac

define PKG_CHECK_VAR if it doesn't exist

Fixes #19

Master: Fixes for #6 and #13

4.0: Fixes for #6  and #13

Access pkg-config variables the autoconf-way

Fixes #13 (github issue)

Fixes #6	(github issue)

Access pkg-config variables the autoconf-way

Fixes #13 (github issue)

Fixes #6 (github issue)

To make it more clear that we provide this as an example for anyone
to use for whatever purpose, change the license to public domain.

Fixes:		#12 (github issue)

Conflicts:
	configure.ac

To make it more clear that we provide this as an example for anyone
to use for whatever purpose, change the license to public domain.

Fixes:		#12 (github issue)

There is a compatibility macro added to varnish.m4 in 4.0.3,
so we can build VMODs on EL6 now.

Inspired by pull request to libvmod-ipcast from Martin Probst.