Add Socket Libraries.

Add Posix functions for porting compatibility.
Fix compliance issues with ISO/IEC 9899:199409
New Functions:
  setenv(), fparseln(), GetFileNameFromPath(), rename(),
  realpath(), setprogname(), getprogname(), strlcat(), strlcpy(),
  strsep(), setitimer(), getitimer(), timegm(), getopt(), basename(),
  mkstemp(), ffs(), vsnprintf(), snprintf(), getpass(), usleep(), select(),
  writev(), strcasecmp(), getcwd(), chdir(), tcgetpgrp(), getpgrp(), gettimeofday(),
  bcopy(), 


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12061 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/Include/errno.h

@@ -34,6 +34,8 @@ extern  RETURN_STATUS   EFIerrno;
 
 // Define error number in terms of the ENUM in <sys/errno.h>
 
+#define ERESTART          -1                      /* restart syscall */
+
 #define EMINERRORVAL      __EMINERRORVAL          /* The lowest valid error value */
 
 #define EPERM             __EPERM                 /*  1   Operation not permitted */