Revert "Add fmpz_mod_vec_rand"

I added _fmpz_mod_vec_rand with the intent to use it in
_mpn_mod_vec_rand but did not use it in the end.

This reverts commit f98e52c.

Author: dlesnoff

doc/source/fmpz_mod_vec.rst

@@ -8,7 +8,7 @@ Conversions
 
 .. function:: void _fmpz_mod_vec_set_fmpz_vec(fmpz * A, const fmpz * B, slong len, const fmpz_mod_ctx_t ctx)
 
-    Set the `fmpz_{mod}_{vec}` `(A, len)` to the `fmpz_{vec}` `(B, len)` after
+    Set the `fmpz_mod_vec` `(A, len)` to the `fmpz_vec` `(B, len)` after
     reduction of each entry modulo the modulus..
 
 Arithmetic
@@ -61,10 +61,3 @@ Multiplication
 .. function:: void _fmpz_mod_vec_mul(fmpz * A, const fmpz * B, const fmpz * C, slong len, const fmpz_mod_ctx_t ctx)
 
     Set `(A, len)` the pointwise multiplication of `(B, len)` and `(C, len)`.
-
-Random functions
---------------------------------------------------------------------------------
-
-.. function:: void _fmpz_mod_vec_rand(fmpz * A, flint_rand_t state, slong len, const fmpz_mod_ctx_t ctx)
-
-    Sets ``vec`` to a vector of the given length with entries picked uniformly at random in `[0, mod.n)`.

src/fmpz_mod_vec.h

@@ -55,8 +55,6 @@ void _fmpz_mod_vec_dot(fmpz_t d, const fmpz * A, const fmpz * B,
 void _fmpz_mod_vec_dot_rev(fmpz_t r, const fmpz * a,
 		          const fmpz * b, slong len, const fmpz_mod_ctx_t ctx);
 
-void _fmpz_mod_vec_rand(fmpz *A, flint_rand_t state, slong len, const fmpz_mod_ctx_t ctx);
-
 #ifdef __cplusplus
 }
 #endif