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Introduce USE_HOST_4_8 Flag

* This will enable Host 4.6 by default for devices that can't handle Host 4.8

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

True not yes

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	core/clang/HOST_x86_common.mk
	core/combo/HOST_linux-x86.mk
	core/combo/HOST_linux-x86_64.mk
Fixing things