Scilab: fix seg fault on tests naturalvar, li_std_string
Scilab: fix debug infos in config.log

display scilab executable, version and startup options, remove cc options
Scilab: add Scilab in makefile check version targets
Merge pull request #74 from smarchetto/gsoc2012-scilab

Scilab: Fix test-suite crashes, fix configure log, and display Scilab version