setupvars.sh: Removing extra semicolon, which breaks glibc build (#11849)

This extra semicolon creates an output as example below. The extra
'::' is equivalent to add '.' as part of the LD_LIBRARY_PATH. This
breaks glibc build, and very often creates weird issue when launch
commands from different path.

...inference_engine/external/tbb/lib::/opt/intel/openvino_2021/...

We also noticed that :${parameter:+:$parameter} is widely used in
this file. Please review the code and fix as needed.

scripts/setupvars/setupvars.sh

@@ -51,7 +51,7 @@ if [ -e "$INSTALLDIR/runtime/3rdparty/tbb" ]; then
     if [[ "$OSTYPE" == "darwin"* ]]; then
         export DYLD_LIBRARY_PATH=$INSTALLDIR/runtime/3rdparty/tbb/lib:${DYLD_LIBRARY_PATH:+:$DYLD_LIBRARY_PATH}
     fi
-    export LD_LIBRARY_PATH=$INSTALLDIR/runtime/3rdparty/tbb/lib:${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+    export LD_LIBRARY_PATH=$INSTALLDIR/runtime/3rdparty/tbb/lib:${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH}
     export TBB_DIR=$INSTALLDIR/runtime/3rdparty/tbb/cmake
 fi