[patch] Prefix mangling

[Jules Bergmann]

This patch adds:

  * set-prefix.sh script to adjust the prefixes in the pkg-config .pc
    files after a binary package has been installed on a user machine.

    For example, suppose you untar the package in your home directory:

	cd $HOME
	tar xfj sourceryvsipl++-....tar.bz2
	$HOME/usr/local/sbin/set-prefix.sh
	export PKG_CONFIG_PATH=$HOME/usr/local/lib/pkgconfig

    and you're in business.

    The set-prefix.sh gets installed in usr/local/sbin of the tarball.
    Is there a better place?  I was tempted to put it in the same
    directory as the .pc files.

  * fix-intel-pkg-config.sh script to post-process the .pc files so that
    references to IPP and MKL library paths are done through variables.
    Two new variables are added (ipp_prefix and mkl_prefix).  References
    to the hard-coded paths are replaced with references through the
    variables.  This post processing is done at the end of configure,
    after vsipl++.pc has been generated.

    This allows (a) the paths to IPP and MKL to be more easily
    overridden, for example
	pkg-config --define-variable=ipp_prefix=/new/prefix/to/ipp
    (b) the set-prefix.sh script to adjust the prefixes after
    package installation.

    For example, continuing the example above, suppose your IPP
    library is also installed in your home directory ($HOME/ipp).
    By passing an '-i' option to set-prefix.sh:

	$HOME/usr/local/sbin/set-prefix.sh -i $HOME/ipp

    The .pc files will be updated accordingly.

  * Documentation for using set-prefix.sh in the quickstart.

  * Stand-alone makefiles for building the tests and benchmarks
    using pkg-config.

				-- Jules
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