Define S_IREAD|IWRITE macros using IRUSR|IWUSR

On platforms such as Android, legacy macros are no longer defined.
Hence, we define them in terms of the new POSIX macros if the new ones are defined. Otherwise, we throw an error.

Signed-off-by: Mohamed A. Bamakhrama <mohamed@alumni.tum.de>
Signed-off-by: Miodrag Milanovic <mmicko@gmail.com>

src/misc/util/utilFile.c

@@ -25,6 +25,23 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 
+// Handle legacy macros
+#if !defined(S_IREAD)
+#if defined(S_IRUSR)
+#define S_IREAD S_IRUSR
+#else
+#error S_IREAD is undefined
+#endif
+#endif
+
+#if !defined(S_IWRITE)
+#if defined(S_IWUSR)
+#define S_IWRITE S_IWUSR
+#else
+#error S_IWRITE is undefined
+#endif
+#endif
+
 #if defined(_MSC_VER) || defined(__MINGW32__)
 #include <windows.h>
 #include <process.h>