Move the stand/usb test loader into its own directory.
Fix its Makefile to build correctly.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Fix relative location of USB sources after recent move.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Centralize several variables.

MK_CTF, MK_SSP, MK_PROFILE, NO_PIC, and INTERNALLIB are always the
same, so set them in defs.mk. MAN= is common, so set it here too.
This removes a lot of boring repeti

Centralize several variables.

MK_CTF, MK_SSP, MK_PROFILE, NO_PIC, and INTERNALLIB are always the
same, so set them in defs.mk. MAN= is common, so set it here too.
This removes a lot of boring repetition from the Makefiles that added
almost no value.

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