fix stand-alone "check" for <Nim-1.4.0

and prevent a theoretical integer overflow

tests/tunittest.nim

@@ -177,3 +177,7 @@ when defined(testing):
       check false == matchFilter("suite1", "foo", "*ite2::")
       check matchFilter("suite1", "q**we::foo", "q**we::foo")
       check matchFilter("suite1", "a::b*c::d*e", "a::b*c::d*e")
+
+# Also supposed to work outside tests:
+check 1 == 1
+

unittest2.nim

@@ -687,7 +687,7 @@ template test*(name, body) =
 
     finally:
       if testStatusIMPL == TestStatus.FAILED:
-        programResult += 1
+        programResult = 1
       let testResult = TestResult(
         suiteName: testSuiteName,
         testName: name,
@@ -734,7 +734,7 @@ template fail* =
   when declared(testStatusIMPL):
     testStatusIMPL = TestStatus.FAILED
   else:
-    setProgramResult 1
+    programResult = 1
 
   ensureInitialized()