bug(xcelium): DPI libraries are added as a list of list to command arguments

[tymonx]

When adding DPI libraries to the xcelium backend, they are added to the xrun command as ['-sv_lib', '<library>.so'] not as -sv_lib <library>.so. This is because created list of command arguments with DPI libraries is a list of list instead of flat list.

Root cause:

edalize/edalize/tools/xcelium.py

Line 104 in 7e5f16f

dpi_lib_cmd.append(["-sv_lib", lib])

Current command:

xrun ['-sv_lib', '<library>.so'] ...

Expected command:

xrun -sv_lib <library>.so ...

Fix:

dpi_lib_cmd.extend(("-sv_lib", lib))

[tymonx]

Additionally, the -sv_lib argument is not part of the elaboration stage but runtime:

xmsim -help | grep -i sv_lib
        -SV_LIB <arg>                       -- Dynamically load a DPI Library
        -SV_ROOT <arg>                      -- Specify root path for -sv_lib switch

xmelab -help | grep -i sv_lib
<nothing>

We will need also move the -sv_lib <library> invocation to the run method.