schtasks/tests: Deleting folders requires elevated privileges on Windows 7 & 8.

This means skipping any test that requires creating a task as the test
would be unable to clean up after itself.

Wine-Bug: https://bugs.winehq.org//show_bug.cgi?id=52193
Wine-Bug: https://bugs.winehq.org//show_bug.cgi?id=54634

programs/schtasks/tests/Makefile.in

@@ -1,5 +1,5 @@
 TESTDLL   = schtasks.exe
-IMPORTS   = ole32
+IMPORTS   = advapi32 ole32
 
 
 C_SRCS = \

programs/schtasks/tests/schtasks.c

@@ -16,8 +16,11 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include <stdarg.h>
+
 #define COBJMACROS
 
+#include "winternl.h"
 #include "initguid.h"
 #include "taskschd.h"
 
@@ -58,6 +61,37 @@ static WCHAR *a2w(const char *str)
     return ret;
 }
 
+static BOOL is_process_elevated(void)
+{
+    HANDLE token;
+    if (OpenProcessToken( GetCurrentProcess(), TOKEN_QUERY, &token ))
+    {
+        TOKEN_ELEVATION_TYPE type;
+        DWORD size;
+        BOOL ret;
+
+        ret = GetTokenInformation( token, TokenElevationType, &type, sizeof(type), &size );
+        CloseHandle( token );
+        return (ret && type == TokenElevationTypeFull);
+    }
+    return FALSE;
+}
+
+static BOOL check_win_version(int min_major, int min_minor)
+{
+    HMODULE hntdll = GetModuleHandleA("ntdll.dll");
+    NTSTATUS (WINAPI *pRtlGetVersion)(RTL_OSVERSIONINFOEXW *);
+    RTL_OSVERSIONINFOEXW rtlver;
+
+    rtlver.dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOEXW);
+    pRtlGetVersion = (void *)GetProcAddress(hntdll, "RtlGetVersion");
+    pRtlGetVersion(&rtlver);
+    return rtlver.dwMajorVersion > min_major ||
+           (rtlver.dwMajorVersion == min_major &&
+            rtlver.dwMinorVersion >= min_minor);
+}
+#define is_win10_plus() check_win_version(10, 0)
+
 #define run_command(a) _run_command(__LINE__,a)
 static DWORD _run_command(unsigned line, const char *cmd)
 {
@@ -173,6 +207,12 @@ START_TEST(schtasks)
     static WCHAR wine_testW[] = L"\\wine\\test";
     DWORD r;
 
+    if (!is_process_elevated() && !is_win10_plus())
+    {
+        win_skip("Deleting the test folders requires elevated privileges on Windows <= 8\n");
+        return;
+    }
+
     CoInitialize(NULL);
     if(!initialize_task_service()) {
         CoUninitialize();