fix typo

Makefile

@@ -71,7 +71,7 @@ CXX = mpic++
 SOURCEDIR:= Source
 INCLUDEPATH:= $(addprefix $(SOURCEDIR)/, Common/Include CNTKv2LibraryDll CNTKv2LibraryDll/API Math CNTK ActionsLib ComputationNetworkLib SGDLib SequenceTrainingLib CNTK/BrainScript Readers/ReaderLib)
 # COMMON_FLAGS include settings that are passed both to NVCC and C++ compilers.
-COMMON_FLAGS:= i-DHAS_OPENMPI=0 -D_POSIX_SOURCE -D_XOPEN_SOURCE=600 -D__USE_XOPEN2K -std=c++11
+COMMON_FLAGS:= -DHAS_OPENMPI=0 -D_POSIX_SOURCE -D_XOPEN_SOURCE=600 -D__USE_XOPEN2K -std=c++11
 CPPFLAGS:= 
 CXXFLAGS:= -msse4.1 -mssse3 -std=c++0x -fopenmp -fpermissive -fPIC -Werror -fcheck-new
 LIBPATH:=