Included macOS/Darwin beebasm is version 1.08, which won't assemble MMFS

[mincebert]

This bug is mentioned in a separate issue #37, but the Darwin/macOS version of beebasm is still at 1.08, which won't assemble MMFS:

rcf@doraemon MMFS |*master| % ./build.sh 
Building MMFS MMFS2 version 1.60
Using tools/beebasm/beebasm-darwin
Blank build/U/mmfs.ssd created
build/U/mmfs.ssd updated

Building U/EMMFS...
DEVICE.asm:1: error: Bad expression.

_DEVICE_ = "U"
           ^
build failed to create U/EMMFS

This doesn't particularly both me, as I have 1.10 compiled up, in a separate directory, but it probably should be updated or removed. I thought I'd just flag it (I just don't have it in my normal PATH, so I just override that when running build.sh)!