StdLib: Simple code cleanup

StdLib/LibC/Main/Main.c
  Change Print to Debug statements.
  Ensure errno is initialized to 0 before calling main().

StdLib/LibC/StdLib/Malloc.c
  Aesthetic Cleanup: remove unnecessary cast, fix two whitespace alignment problems.

StdLib/LibC/Uefi/InteractiveIO/NonCanonRead.c
  Change Include order.

StdLib/Include/paths.h
  Add definition _PATH_LIB for the path to the library directory: /Efi/StdLib/lib.

StdLib/LibC/Stdio/vfwscanf.c
  Align declarations and initializations.
  Initialize the multipurpose pointer, p, to NULL.


Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Daryl McDaniel <daryl.mcdaniel@intel.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15664 6f19259b-4bc3-4df7-8a09-765794883524
Merge branch 'master' of https://github.com/tianocore/edk2