Removed a now unnecessary 'd' option.

Since I removed the handling of -d already in the previous commits, this
would've just lead to quite undefined behaviour when somebody tried to
use -d with this script.

Build/AtlasBuildScripts/build_atlasexternals.sh

@@ -27,7 +27,7 @@ RPMDIR=""
 BUILDTYPE="Release"
 PROJECTVERSION=""
 EXTRACMAKE=()
-while getopts ":s:b:i:p:r:t:v:hx:d" opt; do
+while getopts ":s:b:i:p:r:t:v:hx:" opt; do
     case $opt in
         s)
             SOURCEDIR=$OPTARG