Revert "shims: handle symlinked scripts, via new PYENV_FILE_ARG"

This reverts commit 493f036928.

# Conflicts:
#	libexec/pyenv

libexec/pyenv

@@ -61,24 +61,6 @@ else
 fi
 export PYENV_ROOT
 
-# Transfer PYENV_FILE_ARG (from shims) into PYENV_DIR.
-if [ -z "${PYENV_DIR}" ]; then
-  if [ -n "${PYENV_FILE_ARG}" ]; then
-    if [ -L "${PYENV_FILE_ARG}" ]; then
-      PYENV_DIR="$(abs_dirname "${PYENV_FILE_ARG}")"
-    else
-      PYENV_DIR="${PYENV_FILE_ARG%/*}"
-    fi
-    export PYENV_DIR
-    unset PYENV_FILE_ARG
-  fi
-else
-  [[ $PYENV_DIR == /* ]] || PYENV_DIR="$PWD/$PYENV_DIR"
-  cd "$PYENV_DIR" 2>/dev/null || abort "cannot change working directory to \`$PYENV_DIR'"
-  PYENV_DIR="$PWD"
-  cd "$OLDPWD"
-fi
-
 if [ -z "${PYENV_DIR}" ]; then
   PYENV_DIR="$PWD"
 fi

libexec/pyenv-rehash

@@ -73,7 +73,7 @@ if [[ "\$program" = "python"* ]]; then
     -c* | -- ) break ;;
     */* )
       if [ -f "\$arg" ]; then
-        export PYENV_FILE_ARG="\$arg"
+        export PYENV_DIR="\${arg%/*}"
         break
       fi
       ;;