download_and_compile.sh: little optimization

download_and_compile.sh

@@ -1532,7 +1532,7 @@ if _elementIn "FGFS" "${WHATTOBUILD[@]}" || \
 
   SCRIPT=run_fgfs.sh
   echo -en "$common" > $SCRIPT
-  echo "./fgfs --fg-root=\"\$PWD/../fgdata\" \"\$@\"" >> $SCRIPT
+  echo "exec ./fgfs --fg-root=\"\$PWD/../fgdata\" \"\$@\"" >> $SCRIPT
   chmod 755 $SCRIPT
 
   SCRIPT=run_fgfs_debug.sh
@@ -1617,7 +1617,7 @@ cd "\$(dirname "\$0")"
 cd '$SUB_INSTALL_DIR/$FGFS_INSTALL_DIR/bin'
 export LD_LIBRARY_PATH='../../$SIMGEAR_INSTALL_DIR/lib:../../$OSG_INSTALL_DIR/lib:../../$OPENRTI_INSTALL_DIR/lib:../../$PLIB_INSTALL_DIR/lib'"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}"
 
-ldd "\$@"
+exec ldd "\$@"
 EndOfScriptText
   chmod 755 "$SCRIPT"
 
@@ -1628,7 +1628,7 @@ EndOfScriptText
 
 d="\$(dirname "\$0")/$SUB_INSTALL_DIR"
 export LD_LIBRARY_PATH="\$d/simgear/lib:\$d/openscenegraph/lib:\$d/openrti/lib:\$d/plib/lib\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}"
-"\$@"
+exec "\$@"
 EndOfScriptText
   chmod 755 "$SCRIPT"
 
@@ -1636,7 +1636,7 @@ EndOfScriptText
   echo "#!/bin/sh" > $SCRIPT
   echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
   echo "cd '$SUB_INSTALL_DIR/$FGFS_INSTALL_DIR/bin'" >> $SCRIPT
-  echo "./fgcom \"\$@\"" >> $SCRIPT
+  echo "exec ./fgcom \"\$@\"" >> $SCRIPT
   chmod 755 $SCRIPT
 fi