solenv: handle error code from ./g
solenv: handle error code from ./g

This avoids "Cannot find the git binary! Is git installed and is in
PATH?" strings in the about dialog when building from a tarball.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core