Buck: Cleanup dependencies in CM integration code

Since [1] Buck implicitly adds :foo and :bar in $(exe :foo) and
$(location :bar) macros to the dependency list of genrule(). The
code base was adjusted to reflect this enhancement in Ie3a9de0b2.
In I996b8d2a1 the unneeded dependencies were partially re-added
in CM integration code.

Re-remove it again.

[1] https://github.com/facebook/buck/issues/128
Change-Id: I8d0aaa5c9f7586f04f169f8362709b1fc7b04dcc
1 file changed