Fix signature of fmpz_poly_randtest_irreducible

[videlec]

Fixes #292

Checklist

• Added an entry in doc/news/.
• Added a test/benchmark for this change.

[videlec]

@w-bruns There is a failure in the integration test with normaliz, any idea?

cp test-nf-Aut/H4_perm_0001-v.aut test-nf-Aut/H4_perm_0001-v.aut.out
6,7c6,7
< Perm 1: 2 1 5 6 3 4 7 8 11 12 9 10 13 14 17 18 15 16 20 19
< Perm 2: 1 3 2 4 7 9 5 10 6 8 13 15 11 16 12 14 17 19 18 20
---
> Perm 1: 1 3 2 4 7 9 5 10 6 8 13 15 11 16 12 14 17 19 18 20
> Perm 2: 2 1 5 6 3 4 7 8 11 12 9 10 13 14 17 18 15 16 20 19
12,13c12,13
< Perm 1: (1 2) (3 5) (4 6) (9 11) (10 12) (15 17) (16 18) (19 20) --
< Perm 2: (2 3) (5 7) (6 9) (8 10) (11 13) (12 15) (14 16) (18 19) --
---
> Perm 1: (2 3) (5 7) (6 9) (8 10) (11 13) (12 15) (14 16) (18 19) --
> Perm 2: (1 2) (3 5) (4 6) (9 11) (10 12) (15 17) (16 18) (19 20) --
23,24c23,24
< Perm 1: 1 2 4 3 7 8 5 6 10 9 11 12
< Perm 2: 1 3 2 5 4 6 7 9 8 11 10 12
---
> Perm 1: 1 3 2 5 4 6 7 9 8 11 10 12
> Perm 2: 1 2 4 3 7 8 5 6 10 9 11 12
29,30c29,30
< Perm 1: (3 4) (5 7) (6 8) (9 10) --
< Perm 2: (2 3) (4 5) (8 9) (10 11) --
---
> Perm 1: (2 3) (4 5) (8 9) (10 11) --
> Perm 2: (3 4) (5 7) (6 8) (9 10) --
make[3]: *** [/tmp/tmp.GmXfiB0N5e/test/Makefile.classic:167: test-nf-Aut/dodecahedron-v.aut.diff] Error 1
make[3]: *** Waiting for unfinished jobs....