Allow '$' in some paths

The icu resource directories contain filenames that have '$'
characters.

Allow paths returned by the Glob functions to contain '$', on the
assumption that real paths on disk are unlikely to contain strings
that are valid ninja variables.  Fix the Build rules to escape any
paths that are passed as Path arguments.  Fix the resource rules to
manually escape the paths that are passed as strings.

Test: m checkbuild
Change-Id: Ie631bc6d96259e592adb280491a365c0df7ed0e2