Added XRUN_COMPILE_ARGS argument to provide arguments to xrun compile…

[benoitdenkinger]

Problem

Argument specific to the xrun -compile command cannot be passed, only arguments that will appear within the makelib endlib arguments using the ARG_COMPILE_ARGS. However, the compile argument can also have arguments and they must appear outside the makelib endlib ones. This is the case, for example, to enable the UVM support, using the uvm and uvmhome <uvmversion> arguments.

Solution

An extra keyword argument called XRUN_COMPILE_ARGS is added to pass such arguments.

[benoitdenkinger]

Re-opened in a new PR (#163) after history problems