Remove extra EXTERNs from asm code

Author: filipnavara

src/coreclr/nativeaot/Runtime/i386/AsmMacros.inc

@@ -165,8 +165,6 @@ RhpWaitForGC2                               equ @RhpWaitForGC2@4
 RhpTrapThreads                              equ _RhpTrapThreads
 RhpStressGc                                 equ @RhpStressGc@0
 RhpGcPoll2                                  equ @RhpGcPoll2@4
-RhHandleGet                                 equ @RhHandleGet@4
-RhpGcSafeZeroMemory                         equ @RhpGcSafeZeroMemory@8
 
 ifdef FEATURE_GC_STRESS
 THREAD__HIJACKFORGCSTRESS                   equ ?HijackForGcStress@Thread@@SGXPAUPAL_LIMITED_CONTEXT@@@Z
@@ -184,9 +182,6 @@ EXTERN RhThrowEx                                : PROC
 EXTERN RhRethrow                                : PROC
 EXTERN RhpGcPoll2                               : PROC
 
-EXTERN RhHandleGet                              : PROC
-EXTERN RhpGcSafeZeroMemory                      : PROC
-
 ifdef FEATURE_GC_STRESS
 EXTERN THREAD__HIJACKFORGCSTRESS                : PROC
 EXTERN RhpStressGc                              : PROC