Update ecllib from statoil master repo commit 0188b08081eb1ac4ade89ac224b8128b4c9b0481

ThirdParty/Ert/cmake/Tests/test_have_readlinkat_decl.c

@@ -0,0 +1,17 @@
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <stdlib.h>
+
+#define NCHAR 63
+
+int main(int argc, char *argv[])
+{
+    char linkname[NCHAR + 1] = { 0 };
+    ssize_t r;
+
+    r = (argc < 2) ? -1
+        : readlinkat(1, argv[1], linkname, NCHAR);
+
+    return (r > 0) ? EXIT_SUCCESS : EXIT_FAILURE;
+}