Bug 547083, configure bails for Python 2.6. check for and use py2.6. r=ted

configure.in

@@ -834,7 +834,7 @@ else
     AC_MSG_RESULT([yes])    
 fi
 
-MOZ_PATH_PROGS(PYTHON, $PYTHON python2.5 python2.4 python)
+MOZ_PATH_PROGS(PYTHON, $PYTHON python2.6 python2.5 python2.4 python)
 if test -z "$PYTHON"; then
     AC_MSG_ERROR([python was not found in \$PATH])
 fi