Update the sockets library code

* Passes conformance and functional tests.
* Builds with GCC 4.4 compiler.

Signed-off by: lpleahy


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12497 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/BsdSocketLib/errno.c

@@ -15,4 +15,7 @@
 #include <sys/errno.h>
 
 
+/**
+  Variable that contains additional error information when an API call fails.
+**/
 int errno;