Macro helper for wrapping a C macro that declares a new C variable.

It handles emitting the appropriate C code for calling the macro. Additionally it defines a new Nim variable using importc which imports the declared variable.

Example:

{.emit: """/*TYPESECTION*/
    /* define example C Macro for testing */
    #define C_DEFINE_VAR(NM, SZ) int NM[SZ]
    #define C_DEFINE_VAR_DUO(NM, SZ, NM2) int NM[SZ]
    """.}

proc CDefineVar*(name: CToken, size: static[int]): array[size, int] {.
  cdeclmacro: "C_DEFINE_VAR".}