added std/errno.hpp according to suggestion in code review.

base/condition_posix.cpp

@@ -7,8 +7,7 @@
 
 #include "../std/stdint.hpp"
 #include "../std/systime.hpp"
-
-#include <sys/errno.h>
+#include "../std/errno.hpp"
 
 #include <pthread.h>
 

std/errno.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "common_defines.hpp"
+#include "target_os.hpp"
+
+#ifdef new
+#undef new
+#endif
+
+// for errno
+#ifdef OMIM_OS_WINDOWS
+  #include <errno.h>
+#else
+  #include <sys/errno.h>
+#endif
+
+#ifdef DEBUG_NEW
+#define new DEBUG_NEW
+#endif