criu: a few fixes to build on Alpine

Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/fsnotify.c

@@ -41,6 +41,7 @@
 #include "namespaces.h"
 #include "pstree.h"
 #include "fault-injection.h"
+#include "syscall-codes.h"
 
 #include "protobuf.h"
 #include "images/fsnotify.pb-c.h"
@@ -104,7 +105,7 @@ static void decode_handle(fh_t *handle, FhEntry *img)
 
 static int open_by_handle(void *arg, int fd, int pid)
 {
-	return open_by_handle_at(fd, arg, O_PATH);
+	return syscall(__NR_open_by_handle_at, fd, arg, O_PATH);
 }
 
 static char *alloc_openable(unsigned int s_dev, unsigned long i_ino, FhEntry *f_handle)

criu/proc_parse.c

@@ -41,6 +41,19 @@
 
 #include <stdlib.h>
 
+#ifndef SIGEV_SIGNAL
+#define SIGEV_SIGNAL    0       /* notify via signal */
+#endif
+#ifndef SIGEV_NONE
+#define SIGEV_NONE      1       /* other notification: meaningless */
+#endif
+#ifndef SIGEV_THREAD
+#define SIGEV_THREAD    2       /* deliver via thread creation */
+#endif
+#ifndef SIGEV_THREAD_ID
+#define SIGEV_THREAD_ID 4       /* deliver to thread */
+#endif
+
 struct buffer {
 	char buf[PAGE_SIZE];
 	char end; /* '\0' */