rune/libenclave/skeleton: Fix a compilation error

In the GNU C Library, "major" is defined by <sys/sysmacros.h> starting from glibc-2.25,
the macros major and minor are only available in <sys/sysmacros.h>. This fix is for historical compatibility.
Signed-off-by: NLiang Yang <liang3.yang@intel.com>

rune/libenclave/internal/runtime/pal/skeleton/liberpal-skeleton.c

@@ -14,7 +14,11 @@
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/time.h>
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 25
 #include <sys/types.h>
+#else
+#include <sys/sysmacros.h>
+#endif
 #include "defines.h"
 #include "sgx_call.h"