Fix mmm to work with an ANDROID_BUILD_TOP that contains a symlink

Change-Id: I3dfc1aa6f10a52c2adc68259ce1cedec2ffd8f0e

envsetup.sh

@@ -663,7 +663,7 @@ function mmm()
         for DIR in $DIRS ; do
             DIR=`echo $DIR | sed -e 's:/$::'`
             if [ -f $DIR/Android.mk ]; then
-                TO_CHOP=`echo $T | wc -c | tr -d ' '`
+                TO_CHOP=`(cd -P -- $T && pwd -P) | wc -c | tr -d ' '`
                 TO_CHOP=`expr $TO_CHOP + 1`
                 START=`PWD= /bin/pwd`
                 MFILE=`echo $START | cut -c${TO_CHOP}-`