StdLib: Change the last argument of the ioctl helper functions to va_list* from void*.

Functions which call these helper functions always pass the last parameter as a va_list argument.
Add a conditional block around a MSFT-only pragma so that stringlist.c will compile with GCC.
Comment-out the Socket Library components within StdLib.dsc.  These components are still in development.

Signed-off-by: darylm503
Reviewed by:   geekboy15A

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12369 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/LibC/Uefi/Devices/UefiShell/daShell.c

@@ -26,6 +26,7 @@
 #include  <errno.h>
 #include  <string.h>
 #include  <stdlib.h>
+#include  <stdarg.h>
 #include  <wctype.h>
 #include  <wchar.h>
 #include  <sys/fcntl.h>
@@ -319,7 +320,7 @@ EFIAPI
 da_ShellIoctl(
   struct __filedes   *filp,
   ULONGN              cmd,
-  void               *argp       ///< May be a pointer or a value
+  va_list             argp
   )
 {
   return -EPERM;