do not expand $PATH when writing

Author: ned-deily

Mac/BuildScript/scripts/postflight.patch-profile

@@ -36,7 +36,7 @@ case "${BSH}" in
     echo "" >> "${RC}"
     echo "# Setting PATH for Python ${PYVER}" >> "${RC}"
     echo "# The original version is saved in .cshrc.pysave" >> "${RC}"
-    echo "set path=(${PYTHON_ROOT}/bin "'$path'")" >> "${RC}"
+    echo "set path=(${PYTHON_ROOT}/bin "'\$path'")" >> "${RC}"
 EOFC
 
     if [ `id -ur` = 0 ]; then
@@ -94,7 +94,7 @@ fi
 echo "" >> "${PR}"
 echo "# Setting PATH for Python ${PYVER}" >> "${PR}"
 echo "# The original version is saved in `basename ${PR}`.pysave" >> "${PR}"
-echo 'PATH="'"${PYTHON_ROOT}/bin"':${PATH}"' >> "${PR}"
+echo 'PATH="'"${PYTHON_ROOT}/bin"':\${PATH}"' >> "${PR}"
 echo 'export PATH' >> "${PR}"
 EOFS