pkg-stats: use correct variable names for convert_to_*autotools

The variable convert_to_autotools is not used in the script.  The correct
variables are convert_to_target_autotools and convert_to_host_autotools.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

support/scripts/pkg-stats

@@ -71,7 +71,8 @@ tr.correct td {
 
 convert_to_generic_target=0
 convert_to_generic_host=0
-convert_to_autotools=0
+convert_to_target_autotools=0
+convert_to_host_autotools=0
 total_patch_count=0
 cnt=0
 for i in $(find package/ -name '*.mk') ; do