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1) Always try to use app_process32/app_process64 to
avoid pulling symlinks (this does not work on win hosts).

2) Don't change the name of linker64 when pulling it from the device
(otherwise symbols from linker64 are not being loaded in 64-bit case).

3) Always pull app_process32/app_process64 as app_process to avoid
inconsistency.

Change-Id: I1e4f066b77ee2fc37b879c1a1924b8396921539c
Signed-off-by: Alexander Ivchenko <alexander.ivchenko@intel.com>