Issue #6174: run_command() with compiler object behind ccache fails.
Issue #6174: run_command() with compiler object behind ccache fails.

When run_command() first parameter is a compiler object, keep additional
exelist values as arguments.

becm/meson,becm/meson,QuLogic/meson,becm/meson,mesonbuild/meson,jpakkane/meson,becm/meson,mesonbuild/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,becm/meson,mesonbuild/meson,pexip/meson,pexip/meson,mesonbuild/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,becm/meson,QuLogic/meson,becm/meson,becm/meson,QuLogic/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,jpakkane/meson,becm/meson,jpakkane/meson,pexip/meson,QuLogic/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,pexip/meson,becm/meson,pexip/meson,pexip/meson,pexip/meson