correct spelling mistake

[EdwardBetts]

[hlef]

codespell reports some more ones (lots of false positives in po/*).

$ codespell *
ChangeLog:41: syncronization  ==> synchronization
ChangeLog:148: incomming  ==> incoming
ChangeLog:387: dependancy  ==> dependency
WARNING: Binary file: data/parcellite.png
intltool-update:296: asume  ==> assume
intltool-update.in:296: asume  ==> assume
po/tr.po:114: adres  ==> address
po/fr.po:171: persistance  ==> persistence
po/fr.po:177: persistant  ==> persistent
po/fr.po:180: persistant  ==> persistent
po/fr.po:267: Persistant  ==> Persistent
po/fr.po:270: persistant  ==> persistent
po/fr.po:273: persistant  ==> persistent
po/fr.po:276: persistant  ==> persistent
po/fr.po:306: persistant  ==> persistent
po/ro.po:91: Exemple  ==> Example
po/pl_PL.po:104: Autor  ==> Author
po/pl_PL.po:105: adres  ==> address
po/pt_BR.po:72: Comando  ==> Commando
po/pt_BR.po:359: comandos  ==> commandos
po/it.po:217: Comando  ==> Commando
src/main.c:678: sytem  ==> system
src/main.c:2127: recieved  ==> received
src/utils.h:71: lenght  ==> length

also, this one gets integrated to the binary:

src/utils.c: g_fprintf(stderr,"NULL evironment\n");