openposix: Fix (hopefully) last two failures

This is a continuation of:

commit 38cc030
Author: Cyril Hrubis <[email protected]>
Date:   Thu Oct 29 15:16:30 2020 +0100

    openposix: Fix two test failures

Hopefully this is a last two, but there may be more cases where we
haven't hit compiler optimization triggering the bug yet.

Fixes: 8c22a59 (openposix: add "static" to all global variables and functions)
Signed-off-by: Cyril Hrubis <[email protected]>

Author: metan-ucw

testcases/open_posix_testsuite/conformance/interfaces/pthread_kill/8-1.c

@@ -75,7 +75,7 @@
 /***********************************    Test cases  *****************************************/
 /********************************************************************************************/
 
-static char do_it = 1;
+static volatile char do_it = 1;
 static unsigned long count_ope = 0;
 #ifdef WITH_SYNCHRO
 static sem_t semsig1;

testcases/open_posix_testsuite/conformance/interfaces/sigwait/6-1.c

@@ -81,7 +81,7 @@
 /***************************    Test case   ***********************************/
 /******************************************************************************/
 
-static int n_awaken = 0;
+static volatile int n_awaken = 0;
 static sigset_t setusr;
 
 /* Thread function */