[GiNaC-list] Linking dl libraries is missing in ginac.pc

[Isuru Fernando]

Hi,

5745deb8 introduced linking with dl libraries, but it was not added to the
.pc files. Therefore list of link flags given by pkg-config is incomplete
and fails if `-ldl` is not added manually.

I have attached a patch which uses CMAKE_DL_LIBS variable (
http://www.cmake.org/cmake/help/cmake2.6docs.html#variable:CMAKE_DL_LIBS)

Thanks,

Isuru Fernando
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