log: Do not include criu-log when not needed

Some files really need only pr_xxx stuff.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/cr-exec.c

@@ -6,7 +6,7 @@
 #include "pstree.h"
 #include "parasite-syscall.h"
 #include "vma.h"
-#include "criu-log.h"
+#include "log.h"
 #include "util.h"
 #include "kerndat.h"
 

criu/shmem.c

@@ -18,7 +18,7 @@
 #include "config.h"
 #include "syscall-codes.h"
 #include "bitops.h"
-#include "criu-log.h"
+#include "log.h"
 #include "page.h"
 
 #include "protobuf.h"

criu/sysfs_parse.c

@@ -9,7 +9,7 @@
 #include <sys/stat.h>
 
 #include "cr_options.h"
-#include "criu-log.h"
+#include "log.h"
 #include "xmalloc.h"
 #include "files.h"
 #include "proc_parse.h"