kernel32/tests: Fix the remaining errors on win95.

dlls/kernel32/tests/codepage.c

@@ -236,6 +236,8 @@ static void test_string_conversion(LPBOOL bUsedDefaultChar)
     if(bUsedDefaultChar) ok(*bUsedDefaultChar == TRUE, "bUsedDefaultChar is %d\n", *bUsedDefaultChar);
     ok(GetLastError() == 0xdeadbeef, "GetLastError() is %u\n", GetLastError());
 
+    if (IsValidCodePage(1251))
+    {
         SetLastError(0xdeadbeef);
         ret = WideCharToMultiByte(1251, 0, &wc2, 1, &mbc, 1, NULL, bUsedDefaultChar);
         ok(ret == 1, "ret is %d\n", ret);
@@ -251,6 +253,9 @@ static void test_string_conversion(LPBOOL bUsedDefaultChar)
         ok(mbc == 97, "mbc is %d\n", mbc);
         if(bUsedDefaultChar) ok(*bUsedDefaultChar == FALSE, "bUsedDefaultChar is %d\n", *bUsedDefaultChar);
         ok(GetLastError() == 0xdeadbeef, "GetLastError() is %u\n", GetLastError());
+    }
+    else
+        skip("Codepage 1251 not available\n");
 
     /* This call triggers the last Win32 error */
     SetLastError(0xdeadbeef);