Trac #34926: Fix tests with giac>=1.9.0.35

A warning `argument is not an equation` has been removed in 1.9.0.35,
which breaks a few tests.

URL: https://trac.sagemath.org/34926
Reported by: arojas
Ticket author(s): Antonio Rojas
Reviewer(s): Matthias Koeppe

Author: Release Manager

src/sage/libs/giac/giac.pyx

@@ -374,8 +374,7 @@ def _giac(s):
 
         sage: x = libgiac('x')
         sage: (1+2*sin(3*x)).solve(x).simplify()
-        Warning, argument is not an equation, solving 1+2*sin(3*x)=0
-        list[-pi/18,7*pi/18]
+        ...list[-pi/18,7*pi/18]
 
         sage: libgiac.solve('sin(3*x)>2*sin(x)',x)
         Traceback (most recent call last):

src/sage/symbolic/relation.py

@@ -935,8 +935,7 @@ def solve(f, *args, **kwds):
 
         sage: f = (sin(x) - 8*cos(x)*sin(x))*(sin(x)^2 + cos(x)) - (2*cos(x)*sin(x) - sin(x))*(-2*sin(x)^2 + 2*cos(x)^2 - cos(x))
         sage: solve(f, x, algorithm='giac')
-        ...
-        [-2*arctan(sqrt(2)), 0, 2*arctan(sqrt(2)), pi]
+        ...[-2*arctan(sqrt(2)), 0, 2*arctan(sqrt(2)), pi]
 
         sage: x, y = SR.var('x,y')
         sage: solve([x+y-4,x*y-3],[x,y],algorithm='giac')
@@ -1440,19 +1439,15 @@ def _giac_solver(f, x, solution_dict=False):
     EXAMPLES::
 
         sage: solve([(2/3)^x-2], [x], algorithm='giac')
-        ...
-        [[-log(2)/(log(3) - log(2))]]
+        ...[[-log(2)/(log(3) - log(2))]]
         sage: solve([(2/3)^x-2], [x], algorithm='giac', solution_dict=True)
-        ...
-        [{x: -log(2)/(log(3) - log(2))}]
+        ...[{x: -log(2)/(log(3) - log(2))}]
 
         sage: f = (sin(x) - 8*cos(x)*sin(x))*(sin(x)^2 + cos(x)) - (2*cos(x)*sin(x) - sin(x))*(-2*sin(x)^2 + 2*cos(x)^2 - cos(x))
         sage: solve(f, x, algorithm='giac')
-        ...
-        [-2*arctan(sqrt(2)), 0, 2*arctan(sqrt(2)), pi]
+        ...[-2*arctan(sqrt(2)), 0, 2*arctan(sqrt(2)), pi]
         sage: solve(f, x, algorithm='giac', solution_dict=True)
-        ...
-        [{x: -2*arctan(sqrt(2))}, {x: 0}, {x: 2*arctan(sqrt(2))}, {x: pi}]
+        ...[{x: -2*arctan(sqrt(2))}, {x: 0}, {x: 2*arctan(sqrt(2))}, {x: pi}]
 
         sage: x, y = SR.var('x,y')
         sage: solve([x+y-7,x*y-10],[x,y],algorithm='giac')