Add quotes to handle dSYM folder path with spaces

[karaiskc]

Issue can be reproduced in bash when DWARF_DSYM_FOLDER_PATH contains whitespace. This results in errors for the find command, e.g. if equal to /Users/user/my dsyms folder :

find: /Users/user/my: No such file or directory
find: dsyms: No such file or directory
find: folder: No such file or directory

Adding quotes fixes the issue.