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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Don't inherit CFLAGS. This a specialized test program, and can be
built with mostly default flags. Do so in anticipation of the rest of
stand not building with system headers.

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Undefine _STANDALONE since this is test code. This is unsastifying,
but since we sadly only have one test, put this in as a stopgap.

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Move sys/boot to stand. Fix all references to new location

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