Fix Phobos dependencies on autodecoding

[Walter Bright]

On 8/16/2019 1:26 PM, lithium iodate wrote:
> On Friday, 16 August 2019 at 20:14:33 UTC, Walter Bright wrote:
>> To repeat an example:
>>
>>     a + b = c
>>
>> Why not have special Unicode code points for when letters are used as 
>> mathematical symbols?
> 
> Uhm, well, the Unicode block "Mathematical Alphanumeric Symbols" already exists 
> and is basically that.

ye gawds:

  https://en.wikipedia.org/wiki/Mathematical_Alphanumeric_Symbols

I see they forgot the phone number code points.