Optimization for $(if ...) function

[Rob W]

The $(if ...) function uses strlen to decide if the expanded condition is true. But it only needs to know if the string is not empty, and not the length of the string.

I think it only needs to test if the first character is not nul. This is the change:

1248c1248
<       result = strlen (expansion);
---
>       result = (*expansion != '\0');

Rob.