Locale independent isspace

Thanks to Sean Robertson

See for details https://sourceforge.net/p/cmusphinx/discussion/help/thread/a9d8ca2e



git-svn-id: http://svn.code.sf.net/p/cmusphinx/code/trunk@12702 94700074-3cef-4d97-a70e-9c8c206c02f5