RFC: add --with-cacao-src-dir option

[Robert Schuster]

Hi,
attached is a patch that adds an option to specify a source directory
(rather than a tarball) to the cacao sources.

The reason I want to have this option is that in OpenEmbedded the
environment downloads, checks (md5 + sha256 sums)
and unpacks the source. With the proposed option we could support that.

If this patch is OK I would also like to see it in IcedTea7.

ChangeLog:

2009-10-01  Robert Schuster  <robertschuster at fsfe.org>

    * configure.ac: Added --with-cacao-src-dir option.
    * acinclude: New macro AC_CHECK_WITH_CACAO_SRC_DIR.
    * Makefile.am: Copy Cacao sources when USE_ALT_CACAO_SRC_DIR is used.
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