Strip old test runner back out of internal, issues and vendor

tests/issues/test_issue_829.odin

@@ -1,7 +1,6 @@
 // Tests issue #829 https://github.com/odin-lang/Odin/issues/829
 package test_issues
 
-import "core:fmt"
 import "core:testing"
 
 /* Original issue #829 example */
@@ -13,6 +12,6 @@ env : map[string]proc(a, b : int) -> int = {
 
 @(test)
 test_orig_ret :: proc(t: ^testing.T) {
-	r := fmt.tprint(env["+"](1, 2))
-	testing.expect(t, r == "3", fmt.tprintf("%s: \"%s\" != \"3\"\n", #procedure, r))
-}
+	r := env["+"](1, 2)
+	testing.expectf(t, r == 3, "%q != 3", r)
+}