Makefile: remove repeated cpp files in LINT_SOURCES (#655)
Makefile: remove repeated cpp files in LINT_SOURCES (#655)

remove repeated cpp source files in LINT_SOURCES:

isolatedata.cpp
makecallback.cpp
morenews.cpp

Signed-off-by: Michael Ira Krufky <00524723a60798c74a43fcc620c25dd7b9ece078@gmail.com>

closes https://github.com/nodejs/nan/issues/654
nodejs/nan,nodejs/nan,nodejs/nan,nodejs/nan