Haye Böhm authored Oct 02, 2018 and Mart Lubbers committed Jan 10, 2019

In some cases you do not want to use the built-in optimizing linker. You
can only use GCC by (for example):

    EnvironmentLinker:	/usr/bin/gcc::-g -lmysqlclient|... (other
    linkers)

Note that :: ensures the options are passed to gcc.

Co-authored-by: Mart Lubbers <mart@martlubbers.net>