ntdll/tests: Run the execution test only on x86 platforms.

dlls/ntdll/tests/info.c

diff --git a/dlls/ntdll/tests/info.c b/dlls/ntdll/tests/info.c
index 2d5c94f..ec1ce3d 100644
--- a/dlls/ntdll/tests/info.c
+++ b/dlls/ntdll/tests/info.c
@@ -1194,10 +1194,12 @@
     addr = NULL;
     status = pNtMapViewOfSection ( h, GetCurrentProcess(), &addr, 0, 0, &offset, &count, ViewShare, 0, PAGE_READWRITE);
     ok( status == STATUS_SUCCESS, "Expected STATUS_SUCCESS, got %08x\n", status);
+#if defined(__x86_64__) || defined(__i386__)
     memset (addr, 0xc3, 1); /* lret ... in both i386 and x86_64 */
     trace("trying to execute code in the readwrite only mapped anon file...\n");
     f = addr;f();
     trace("...done.\n");
+#endif
 
     status = pNtQueryVirtualMemory( GetCurrentProcess(), addr, MemoryBasicInformation, &info, sizeof(info), &retlen );
     ok( status == STATUS_SUCCESS, "Expected STATUS_SUCCESS, got %08x\n", status);