Fix "cpm_add_patches" handling of multiple patch commands #652
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Update "cpm_add_patches" to correctly handle multiple patch files. The "PATCH_COMMAND" executor may not be a shell, so it is not portable to use shell operators like "&&" and "<" in the command. Commands after the initial PATCH_COMMAND should nstead be prefixed by COMMAND, and we can use "-i" to specify that a file is used by the "patch" command.
Resolves #651