Revert "The prototype of DbgPrint() is incorrect, at the end of "inc/efidebug.h"."

A problem was found compiling on GCC 4.8.

This reverts commit 644898eabc06c8efaa3aa54f84cdd468960a2f6c.

gnu-efi-3.0/inc/efidebug.h

@@ -99,7 +99,7 @@ DbgAssert (
     CHAR8   *string
     );
 
-INTN EFIAPI
+INTN
 DbgPrint (
     INTN    mask,
     CHAR8   *format,

gnu-efi-3.0/lib/print.c

@@ -179,7 +179,7 @@ _PoolPrint (
     IN CHAR16   *Buffer
     );
 
-INTN EFIAPI
+INTN
 DbgPrint (
     IN INTN      mask,
     IN CHAR8     *fmt,