shells/ast-ksh: fix build on powerpc64*
Bring back patches committed as part of r346423 to fix build issue:
/wrkdirs/usr/ports/shells/ast-ksh/work/ast-ksh93v/src/lib/libast/hash/hashalloc.c:162:4: error: non-const lvalue reference to type '__builtin_va_list' cannot bind to a temporary of type 'va_list' (aka 'char *')
va_copy(ap, va_listval(va_arg(ap, va_listarg)));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/sys/_stdarg.h:49:32: note: expanded from macro 'va_copy'
#define va_copy(dest, src) __va_copy(dest, src)
^~~~~~~~~~~~~~~~~~~~
/usr/include/sys/_stdarg.h:47:58: note: expanded from macro '__va_copy'
#define __va_copy(dest, src) __builtin_va_copy((dest), (src))
^~~~~
1 error generated.
PR: 255308
Approved by: saper@saper.info (maintainer)
