[PATCH v7 0/3] MR2175: oleaut32: fix VarAbs function for BSTR with positive values

[Jason Millard (＠jsm174)]

While working in vbscript, I noticed abs on a `BSTR` value with a positive number would come back with an invalid value.

Given the following script: 

```
Dim x
x = "30000"
Debug.Print "x" & "=" & abs(x)
```

Outputs:

```
Script.Print 'x=3.08221696253945E-314'
```

After debugging, `pVarIn` gets the R8 value but is never shallow copied into `pVarOut`.

I'm not sure how to write a test case in `oleaut32`, so I included a test case in `vbscript`.

--
  v7: oleaut32: fix VarAbs function for BSTR with positive values
      oleaut32: Fix VarAbs function for BSTR with positive values.
      oleaut32: Remove overflow check for VT_R4 and VT_R8 in VarAbs.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/2175