Doctest: Bug in symbolic GCD computations involving complex I

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For example gcd(I-I*x, x^2-1) will raise a runtime error (because I cannot be converted to Singular by Pynac).

Depends on #23950

Component: symbolics

Author: Ralf Stephan

Branch/Commit: 638a14b

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/23793

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Branch: u/rws/fall_back_to_maxima_with_some_symbolic_gcd_computations

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Author: Ralf Stephan

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Commit: dd43864

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New commits:

dd43864

23793: Fall back to Maxima with some symbolic GCD computations

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Description changed:

--- 
+++ 
@@ -1 +1 @@
-For example `gcd(I-I*x, x^2-1)` will raise a runtime error (because `I` cannot be converted to Singular by Pynac). Maxima can solve this case and possibly others that give a runtime error.
+For example `gcd(I-I*x, x^2-1)` will raise a runtime error (because `I` cannot be converted to Singular by Pynac). 

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Changed branch from u/rws/fall_back_to_maxima_with_some_symbolic_gcd_computations to none

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Changed author from Ralf Stephan to none

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Changed commit from dd43864 to none

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Dependencies: #23950

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comment:3

Actually this is resolved in Pynac-0.7.12 and just needs a doctest.