[PATCH] RTL: Fix options handle and add a new option to rtems-ld

[Peng Fan]

Hi,

1. Fix getopt_long usage in rtl host. some shorthand options are not
hanlded correctly, this patch fixes it.
2. Add a new option '--mach-flags'/'-m' to rtems-ld. This optarg of this
option will be passed to xx-rtemsxx-gcc, it will be used the search lib
dirs. Detailed msg is in the commit log of the patch.

Regards,
Peng.
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