Fixed bug #64197 (_Offsetof() macro used but not defined on ARM/Clang)

Updated the code to test for __ARMCC_VERSION instead of __arm, as
that is a more reliable indicator of whether the ARMCC compiler is
being used.

Author: Ard Biesheuvel

Zend/zend_ini.h

@@ -28,7 +28,7 @@
 #define ZEND_INI_ALL (ZEND_INI_USER|ZEND_INI_PERDIR|ZEND_INI_SYSTEM)
 
 #ifndef XtOffsetOf
-# if defined(CRAY) || (defined(__arm) && !defined(LINUX))
+# if defined(CRAY) || (defined(__ARMCC_VERSION) && !defined(LINUX))
 # ifdef __STDC__
 # define XtOffset(p_type, field) _Offsetof(p_type, field)
 # else