[bug#30629] [PATCH 1/5] Add (guix glob).

[Danny Milosavljevic]

Since this (guix glob) and its tests are new files and we are pretty sure we 
are going to need them, let's push it to master now.

I've tested it using linux-boot so it should be fine ([] should be added later).

+(define (compile-glob-pattern str)
[...]

Add a comment in the front that this pattern is just for saving space only:

>           (""  (loop (+ 1 wildcard-index)
+                      rest
+                      (cons wildcard result)))


LGTM!