(z80asm) C_LINE directive not supported with DEFVARS block

[suborb]

Slightly odd one this!

In stdio.h classic has a DEFVARS within #asm block.

When compiling the library with -debug the output is liberally splattered with C_LINE directives, so that we effectively end up with something like this:

DEFVARS 0 {
        C_LINE  126,"stdio.h"
    fp_desc         ds.w    1

}

Which reports syntax errors.