fix host contamination

Make sure that the Makefile uses gcc cross
compiler from build system, but not use
the host gcc

Signed-off-by: Vu Tran <vu.tran@windriver.com>

diff --git a/Makefile b/Makefile
index 1ae018e..4c23b45 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,3 @@
-CC=gcc
-CXX=g++
 CFLAGS+=-D_FILE_OFFSET_BITS=64
 #CXXFLAGS+=-Wall -D_FILE_OFFSET_BITS=64 -D USE_UTF16
 CXXFLAGS+=-Wall -D_FILE_OFFSET_BITS=64