Trac #33447: Doctest failure on ubuntu-jammy because system Singular is accepted

A trivial failure:

{{{
sage -t --random-seed=297076767328263871294039228926833547139
src/sage/misc/compat.py
**********************************************************************
File "src/sage/misc/compat.py", line 96, in sage.misc.compat
Failed example:
    find_library('Singular')
Expected:
    '...Singular...'
Got:
    <BLANKLINE>
}}}
https://github.com/sagemath/sage/runs/5353145070?check_suite_focus=true

URL: https://trac.sagemath.org/33447
Reported by: mkoeppe
Ticket author(s): Matthias Koeppe
Reviewer(s): Dima Pasechnik

Author: Release Manager

src/sage/misc/compat.py

@@ -93,8 +93,8 @@ def find_library(name):
     EXAMPLES::
 
         sage: from sage.misc.compat import find_library
-        sage: find_library('Singular')
-        '...Singular...'
+        sage: find_library('giac')
+        '...giac...'
 
     """