clangcheck: removed flags not accepted by clang-check (#802)
clangcheck: removed flags not accepted by clang-check (#802)

The extra cmd line flags "-- -Wall -Wextra" are not accepted and
processed by clang-check, moreover they actually prevent it from working
correctly.
bonds/neomake,neomake/neomake,bonds/neomake,euclio/neomake,euclio/neomake,nerdrew/neomake,neomake/neomake,codeinabox/neomake,datanoise/neomake,nerdrew/neomake