individually escape results of $(locations)

proptools.ShellEscape escapes mostly by surrounding the string in
quotes. This makes all the files from a $(locations) be passed as
one shell argument if escaping was needed. Escape them individually
so that they're still passed as separate arguments.

Bug: 307824623
Test: running art tests with aosp/2860435
Change-Id: I9940941f4a7bb4d29d9388e4d57f8cbd732b6d32