Fix supports_typed_pointers pre LLVM 14 (#330)

Author: vchuravy

src/core/context.jl

@@ -30,7 +30,7 @@ GlobalContext() = Context(API.LLVMGetGlobalContext())
 if version() > v"13.0.0"
     supports_typed_pointers(ctx::Context) = API.LLVMContextSupportsTypedPointers(ctx) == 1
 else
-    supports_typed_pointers(ctx::Context) = false
+    supports_typed_pointers(ctx::Context) = true
 end
 
 ## wrapper exception type

test/core.jl

@@ -27,6 +27,13 @@ Context() do ctx end
 
 @dispose ctx=Context() begin
     @test LLVM.supports_typed_pointers(ctx) isa Bool
+    if LLVM.version() > v"15.0.0"
+        @test LLVM.supports_typed_pointers(ctx) == false
+    elseif LLVM.version() > v"14.0.0"
+        @test LLVM.supports_typed_pointers(ctx) isa Bool
+    else
+        @test LLVM.supports_typed_pointers(ctx) == true
+    end
 end
 
 end