sci-mathematics/pari: new version 2.11.2.

sci-mathematics/pari: new version 2.11.2.

This new version was imported from the sage-on-gentoo overlay where
François Bissey has been maintaining it for use with SageMath. I've
made a few changes:

  * Moved the virtual/latex-base dependency into BDEPEND, because
    those tools are run on the build host to create the documentation.

  * Used the existing patches (with different names) where possible.

  * Edited pari-2.10-no-automagic.patch to not mess with PLOTLIBS
    when USE=fltk is set. My build was failing because this patch
    resulted in -lstdc++ being stripped from the linker flags.

  * Dropped empty variable "${mymake}" in a few places.

  * Enabled the full test suite, which passes for me if I lie to pari
    about the number of columns my terminal has (???).

  * Installed some extra documentation by setting DOCS and calling
    the default implementation of src_install.

  * Used "usex" instead of an "if" statement for a ./Configure flag.

  * Changed "export CPLUSPLUS=$(tc-getCXX)" to "tc-export CXX". The
    CPLUSPLUS variable doesn't appear anywhere in the source, so I
    doubt this was doing anything. It may not even be necessary to
    export CC/CXX any longer.

  * Added RESTRICT="!test? ( test )" now that we run the test suite.

  * Added myself and François as maintainers.

Closes: https://bugs.gentoo.org/703156
Package-Manager: Portage-2.3.79, Repoman-2.3.16
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>