translate alias align from C to D

[Dakota]

```c
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L)
# include <stdalign.h>
#endif

#if defined(_MSC_VER)
/* do not use alignment for older visual studio versions */
#  if _MSC_VER < 1913 /*  Visual Studio 2017 version 15.6  */
#    define CGLM_ALL_UNALIGNED
#    define CGLM_ALIGN(X) /* no alignment */
#  else
#    define CGLM_ALIGN(X) __declspec(align(X))
#  endif
#else
#  define CGLM_ALIGN(X) __attribute((aligned(X)))
#endif

#ifndef CGLM_ALL_UNALIGNED
#  define CGLM_ALIGN_IF(X) CGLM_ALIGN(X)
#else
#  define CGLM_ALIGN_IF(X) /* no alignment */
#endif

#ifdef __AVX__
#  define CGLM_ALIGN_MAT CGLM_ALIGN(32)
#else
#  define CGLM_ALIGN_MAT CGLM_ALIGN(16)
#endif

typedef CGLM_ALIGN_IF(16) float vec4[4];
typedef CGLM_ALIGN_IF(16) vec2  mat2[2];
typedef CGLM_ALIGN_MAT    vec4  mat4[4];
```

I want tranlate this into d without importC, what is the best way 
to do it?