scripts: allow build_parameters.sh to work from either APM directory or above

Tools/scripts/build_autotest.sh

@@ -116,7 +116,7 @@ mkdir -p "buildlogs/history/$hdate"
 (cd buildlogs && cp -f *.txt *.flashlog *.tlog *.km[lz] *.gpx *.html *.png "history/$hdate/")
 echo $githash > "buildlogs/history/$hdate/githash.txt"
 
-APM/Tools/scripts/build_parameters.sh
+(cd APM && Tools/scripts/build_parameters.sh)
 
 timelimit 4700 APM/Tools/autotest/autotest.py --timeout=4500 > buildlogs/autotest-output.txt 2>&1
 

Tools/scripts/build_parameters.sh

@@ -2,7 +2,9 @@
 
 set -e
 
-cd APM
+# work from either APM directory or above
+[ -d ArduPlane ] || cd APM
+
 ./Tools/autotest/param_metadata/param_parse.py > param.out || exit 1
 /bin/mkdir -p ../buildlogs/Parameters
 /bin/cp Parameters.wiki Parameters.html *.pdef.xml ../buildlogs/Parameters/