Delete stale check, make SCons support globbing with # inside path

[dustdfg]

Some parts ¹²³ of the buildsystem already were using it with # in path.

I currently work on making buildsystem prettier and more flexible so now I extracted small part of planned work which certainly shouldn't cause any problems

Additionally deleted some unnecessary leading slashes which created several paths with //. It didn't cause any problems but they were unnecessary

Footnotes

1. https://github.com/godotengine/godot/blob/c6c464cf9ae56e8b68620af65125dd980d0e8122/editor/icons/SCsub#L22 ↩

2. https://github.com/godotengine/godot/blob/c6c464cf9ae56e8b68620af65125dd980d0e8122/editor/SCsub#L71 ↩

3. currently not merged PR by Repiteo ;) https://github.com/godotengine/godot/pull/98653/files#diff-5d2591fb5837decc3fec5e4992821a185ad895888924e4e736a31c7756c067f8R113 ↩

[dustdfg]

Oh and one more thing it seemed to me that check for (str, bytes) is redundant so I changed it to str. If it isn't so let me know

[Repiteo]

Must've been around for a while, seeing as even the legacy versions are passing without issue. And yeah, we aren't passing in byte paths anywhere in the repo, so shortening it to just str checks out

[Repiteo]

Thanks!