Remove duplicate exports from Makefile
Remove duplicate exports from Makefile

We already export these variables earlier in the Makefile, right
after they were 'declared'.  There is no point in doing so again.

Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git