NTDLL doesn't compile under Clang

[C.W. Betts]

When compiling the NTDLL component of Wine, I get the following error:
../../../wine-git/./dlls/ntdll/large_int.c:267:13: error: unknown use of
      instruction mnemonic without a size suffix
    __asm__("div %4,%%eax"
            ^
<inline asm>:1:2: note: instantiated into assembly here
        div 12(%esp),%eax
        ^
I'm using Clang 2.0 from Xcode 4.0