sh.rust-web-install: avoid problems with new CBE 11.4.81 release

Author: psumbera

sh.rust-web-install

@@ -21,8 +21,7 @@ fi
 
 ( cd $RUST_SOLARIS_DIR; rm -f bin; ln -s rustc-$RUST_SOLARIS_VERSION/bin bin )
 
-echo $PATH | grep $RUST_SOLARIS_DIR/rustc-$RUST_SOLARIS_VERSION/bin > /dev/null
-if [ $? -ne 0 ] ; then
+if ! echo "$PATH" | grep -q "$RUST_SOLARIS_DIR/rustc-$RUST_SOLARIS_VERSION/bin" ; then
   PATH=$RUST_SOLARIS_DIR/rustc-$RUST_SOLARIS_VERSION/bin:$PATH
   echo "PATH was modified to: PATH=$RUST_SOLARIS_DIR/rustc-$RUST_SOLARIS_VERSION/bin:\$PATH"
 fi