crypt32: Remove a test that fails on some Windows 98 systems, and document it.

dlls/crypt32/tests/sip.c

@@ -72,7 +72,12 @@ static void test_AddRemoveProvider(void)
     }
     else
     {
-        ok (!ret, "Expected CryptSIPRemoveProvider to fail.\n");
+        /* On some Win98 systems, CryptSIPRemoveProvider always succeeds if
+         * the arguments are correct, whether or not the registry key is
+         * present, so don't test ret, just check the last error if it does
+         * return FALSE.
+         */
+        if (!ret)
             ok (GetLastError() == ERROR_FILE_NOT_FOUND,
                 "Expected ERROR_FILE_NOT_FOUND, got %d.\n", GetLastError());
     }
@@ -104,7 +109,12 @@ static void test_AddRemoveProvider(void)
      */
     SetLastError(0xdeadbeef);
     ret = CryptSIPRemoveProvider(&actionid);
-    ok (!ret, "Expected CryptSIPRemoveProvider to fail.\n");
+    /* On some Win98 systems, CryptSIPRemoveProvider always succeeds if
+     * the arguments are correct, whether or not the registry key is
+     * present, so don't test ret, just check the last error if it does
+     * return FALSE.
+     */
+    if (!ret)
         ok (GetLastError() == ERROR_FILE_NOT_FOUND,
             "Expected ERROR_FILE_NOT_FOUND, got %d.\n", GetLastError());