[Bug 46106] New: Stable: ARM64 build broken with gcc

https://bugs.winehq.org/show_bug.cgi?id=46106

Bug ID: 46106
           Summary: Stable: ARM64 build broken with gcc
           Product: Wine
           Version: 3.0.3
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: build-env
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---
> From Jens Reyer, the Debian Wine maintainer:

"wine-3.0.2-27-g295359a174 causes a build failure on Debian unstable
arm64, because now you need clang >= 5.0 to build Wine for arm64 (so far
we don't build with clang at all there)."

commit 295359a17447d6ad487b6c652c3a98bbe17cee6e
Author: Martin Storsjo 
Date:   Wed May 9 23:34:57 2018 +0300

arm64: Use __builtin_ms_va_list and __attribute__((ms_abi)) on arm64.

Windows uses a different ABI for va_list on arm64 just like on x86_64.

On x86_64, the calling convention for windows functions is completely
    different from the one on other platforms. On arm64, they're mostly the
    same, with the only exception being variadic functions (where all float
    arguments are passed in integer registers, since the va_list is a single
    pointer).

Any functions using __builtin_ms_va_start need to be decorated with
    __attribute__((ms_abi)).

Signed-off-by: Martin Storsjo 
    Signed-off-by: Alexandre Julliard 
    (cherry picked from commit 8fb8cc03c3edb599dd98f369e14a08f899cbff95)
    Signed-off-by: Michael Stefaniuc