ntdll: Clear alignment check flag before entering exception handler.

dlls/ntdll/signal_i386.c

@@ -924,7 +924,8 @@ static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func fun
     /* now modify the sigcontext to return to the raise function */
     ESP_sig(sigcontext) = (DWORD)stack;
     EIP_sig(sigcontext) = (DWORD)func;
-    EFL_sig(sigcontext) &= ~0x100;  /* clear single-step flag */
+    /* clear single-step and align check flag */
+    EFL_sig(sigcontext) &= ~(0x100|0x40000); 
     CS_sig(sigcontext)  = wine_get_cs();
     DS_sig(sigcontext)  = wine_get_ds();
     ES_sig(sigcontext)  = wine_get_es();