ShellPkg: Fix MSFT C4255 warning

V2:
Fix MSFT C4255 warning
V1:
Enable MSFT C4255 warning.

From MSDN:
Compiler Warning (level 4) C4255
function' : no function prototype given: converting '()' to '(void)'
The compiler did not find an explicit list of arguments to a function.
This warning is for the C compiler only.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bell Song <binx.song@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

ShellPkg/Application/Shell/Shell.c

@@ -726,6 +726,7 @@ FreeResources:
 **/
 EFI_STATUS
 SetBuiltInAlias(
+  VOID
   )
 {
   EFI_STATUS          Status;

ShellPkg/Application/Shell/ShellProtocol.c

@@ -1679,6 +1679,7 @@ InternalShellExecute(
 STATIC
 BOOLEAN
 NestingEnabled(
+  VOID
 )
 {
   EFI_STATUS  Status;
@@ -3286,6 +3287,7 @@ EfiShellIsRootShell(
 **/
 CHAR16 *
 InternalEfiShellGetListAlias(
+  VOID
   )
 {
   

ShellPkg/Library/UefiShellLib/UefiShellLib.c

@@ -369,6 +369,7 @@ ShellLibDestructor (
 EFI_STATUS
 EFIAPI
 ShellInitialize (
+  VOID
   )
 {
   EFI_STATUS Status;