StdLib/LibC: Fix ARM symbol problems

StdLibPrivateInternalFiles: Add AArch64 support

Disable 'memcpy' symbol for ARM in LibC. It is already provided by the ARM compiler intrinsics library.
Add missing 'strtold' symbol. Use the same fallback as IPF for now.
Use Include definitions as provided by ARM version.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Harry Liebel <Harry.Liebel@arm.com>
Reviewed-By: Olivier Martin <olivier.martin@arm.com>
Reviewed-By: Daryl McDaniel <daryl.mcdaniel@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15858 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/LibC/String/Copying.c

@@ -19,11 +19,12 @@
 #include  <stdlib.h>
 #include  <string.h>
 
-/** Do not define memcpy for IPF+GCC builds.
+/** Do not define memcpy for IPF+GCC or ARM+GCC builds.
     For IPF, using a GCC compiler, the memcpy function is converted to
     CopyMem by objcpy during build.
+    For ARM, the memcpy function is provided by the CompilerIntrinsics library.
 **/
-#if  !(defined(MDE_CPU_IPF) && defined(__GNUC__))
+#if !((defined(MDE_CPU_IPF) || defined(MDE_CPU_ARM)) && defined(__GNUC__))
 /** The memcpy function copies n characters from the object pointed to by s2
     into the object pointed to by s1.
 

StdLib/LibC/gdtoa/gdtoa.inf

@@ -44,6 +44,7 @@
 
 [Sources.ARM]
   strtof.c
+  Ipf/strtold.c
 
 [Sources]
   strtod.c      # Public interfaces

StdLibPrivateInternalFiles/DoNotUse.dec

@@ -33,3 +33,7 @@
 
 [Includes.ARM]
   Include/Arm
+
+[Includes.AARCH64]
+  # Use the ARM headers for now.
+  Include/Arm