Exclude sparse det tests on non-GPL builds

Author: ElOceanografo

test/rulesets/SparseArrays/sparsematrix.jl

@@ -79,12 +79,14 @@ end
     test_rrule(findnz, v ⊢ dv, output_tangent=(zeros(length(I)), V̄))
 end
 
-@testset "[log[abs[det]]] SparseMatrixCSC" begin
-    ii = [1:5; 2; 4]
-    jj = [1:5; 4; 2]
-    x = [ones(5); 0.1; 0.1]
-    A = sparse(ii, jj, x)
-    test_rrule(logabsdet, A)
-    test_rrule(logdet, A)
-    test_rrule(det, A)
+if Base.USE_GPL_LIBS # these rrules don't work without CHOLMOD from SuiteSparse.jl
+    @testset "[log[abs[det]]] SparseMatrixCSC" begin
+        ii = [1:5; 2; 4]
+        jj = [1:5; 4; 2]
+        x = [ones(5); 0.1; 0.1]
+        A = sparse(ii, jj, x)
+        test_rrule(logabsdet, A)
+        test_rrule(logdet, A)
+        test_rrule(det, A)
+    end
 end