spkg/bin/sage: do not change directory

[jdemeyer]

Remove all unneeded "cd" statements from spkg/bin/sage.

Apply:

1. attachment: 13459_no_cd.patch to the SAGE_ROOT repository.
2. attachment: 13459_no_cd_scripts.patch to the SCRIPTS repository.

Component: scripts

Author: Jeroen Demeyer

Reviewer: John Palmieri

Merged: sage-5.4.rc0

Issue created by migration from https://trac.sagemath.org/ticket/13459

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1,6 +1 @@
-For some unclear reason, there is a
-
-```
-cd "$SAGE_ROOT/local/bin"
-```
-in the `sage_setup()` function in `spkg/bin/sage`.  Remove this.
+Remove all unneeded "cd" statements from `spkg/bin/sage`.

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1 +1,5 @@
 Remove all unneeded "cd" statements from `spkg/bin/sage`.
+
+Apply:
+1. [attachment: 13459_no_cd.patch](https://github.com/sagemath/sage-prod/files/10656343/13459_no_cd.patch.gz) to the SAGE_ROOT repository.
+2. [attachment: 13459_no_cd_scripts.patch](https://github.com/sagemath/sage-prod/files/10656344/13459_no_cd_scripts.patch.gz) to the SCRIPTS repository.

[jdemeyer]

Attachment: 13459_no_cd.patch.gz

[jdemeyer]

comment:3

There is a problem with

import sage

when the current directory is $SAGE_ROOT/devel/sage (or more generally, when a directory sage exists).