src/system/helpers.cpp: Add function readLink()

Origin commit data
------------------
Commit: 0c182785e2
Author: Michael Liebmann <tuxcode.bbg@gmail.com>
Date: 2017-02-22 (Wed, 22 Feb 2017)

src/system/helpers.cpp

@@ -1272,3 +1272,13 @@ std::string Lang2ISO639_1(std::string& lang)
 
 	return ret;
 }
+
+string readLink(string lnk)
+{
+	char buf[PATH_MAX];
+	memset(buf, 0, sizeof(buf)-1);
+	if (readlink(lnk.c_str(), buf, sizeof(buf)-1) != -1)
+		return (string)buf;
+
+	return "";
+}