Revert "Add betainc C implementation (pymc-devs#798)"

This reverts commit 31bf682.

Author: ricardoV94

pytensor/scalar/c_code/incbet.c

@@ -1495,25 +1495,8 @@ def grad(self, inp, grads):
             ),
         ]
 
-    def c_support_code(self, **kwargs):
-        with open(os.path.join(os.path.dirname(__file__), "c_code", "incbet.c")) as f:
-            raw = f.read()
-            return raw
-
-    def c_code(self, node, name, inp, out, sub):
-        (a, b, x) = inp
-        (z,) = out
-        if (
-            node.inputs[0].type in float_types
-            and node.inputs[1].type in float_types
-            and node.inputs[2].type in float_types
-        ):
-            return f"""{z} = BetaInc({a}, {b}, {x});"""
-
-        raise NotImplementedError("type not supported", type)
-
-    def c_code_cache_version(self):
-        return (1,)
+    def c_code(self, *args, **kwargs):
+        raise NotImplementedError()
 
 
 betainc = BetaInc(upgrade_to_float_no_complex, name="betainc")