PATCH: Refine vsipl++.pc generation

[Stefan Seefeld]

This patch refines the vsipl++.pc generation patch I sent out earlier.
Options to report header / library paths and options to report compiler /
linker flags are separated a little more clear now.

It is thus suggested that users use 'pkg-config vsipl++ --variable cppflags'
to obtain include paths, and 'pkg-config vsipl++ --variable cxxflags' to
obtain the set of compiler flags used to compile libvsip.a (and thus,
the flags we would suggest users to use for their own vsipl++ applications).

These options should probably be documented in the quickstart guide.

Regards,
		Stefan
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